Method and apparatus for managing CPU for on-demand SSB in wireless communication system

Abstract

The present disclosure provides a method and apparatus for supporting a higher transmission rate by; receiving configuration information about an OD-SSB from a base station; receiving, from the base station, DCI for triggering SP-CSI; receiving, from the base station, a MAC CE for triggering the OD-SSB on a PDSCH scheduled by the DCI; receiving one or more OD-SSBs from the base station on the basis of the MAC CE; and transmitting, to the base station, CSI reports on the one or more OD-SSBs, wherein a CSI processing unit (CPU) occupation time for the one or more OD-SSBs is determined to be from a first time point related to the MAC CE to a second time point at which the CSI reports are transmitted.

Description

CPU management method and device for ON-DEMAND SSB in a wireless communication system

[0001] The present disclosure relates to the operation of a terminal and a base station in a wireless communication system (or, mobile communication system). Specifically, the present disclosure relates to a method and apparatus for energy saving in a wireless communication system.

[0002] 5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and can be implemented not only in frequency bands below 6 GHz ('Sub 6 GHz'), such as 3.5 gigahertz (3.5 GHz), but also in ultra-high frequency bands called millimeter waves (mmWave), such as 28 GHz and 39 GHz ('Above 6 GHz'). In addition, for 6G mobile communication technology, which is referred to as a system beyond 5G, implementation in the terahertz band (e.g., the 3 terahertz (3 THz) band at 95 GHz) is being considered to achieve transmission speeds 50 times faster and ultra-low latency reduced to one-tenth compared to 5G mobile communication technology.

[0003] In the early stages of 5G mobile communication technology, aiming to satisfy service support and performance requirements for enhanced Mobile BroadBand (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and massive Machine-Type Communications (mMTC), technologies such as beamforming and Massive MIMO to mitigate path loss and increase transmission distance in ultra-high frequency bands, support for various numerologies (such as the operation of multiple subcarrier spacings) and dynamic operation of slot formats for the efficient utilization of ultra-high frequency resources, initial access techniques to support multi-beam transmission and broadband, definition and operation of Band-Width Parts (BWP), Low Density Parity Check (LDPC) codes for high-volume data transmission, new channel coding methods such as Polar Codes for the reliable transmission of control information, and L2 pre-processing (L2 Standardization has been carried out for pre-processing, network slicing which provides a dedicated network specialized for specific services, and other methods.

[0004] Currently, discussions are underway to improve and enhance the performance of the initial 5G mobile communication technology, taking into account the services that the 5G mobile communication technology was intended to support. Additionally, standardization of the physical layer is in progress for technologies such as V2X (Vehicle-to-Everything), which helps autonomous vehicles make driving decisions and enhance user convenience based on their own location and status information transmitted by the vehicle; NR-U (New Radio Unlicensed), which aims for system operation in unlicensed bands to comply with various regulatory requirements; NR terminal low power consumption technology (UE Power Saving); Non-Terrestrial Network (NTN), which is direct terminal-satellite communication for securing coverage in areas where communication with the terrestrial network is impossible; and positioning.

[0005] In addition, standardization is underway in the field of wireless interface architecture / protocols for technologies such as the Industrial Internet of Things (IIoT) for supporting new services through linkage and convergence with other industries, Integrated Access and Backhaul (IAB) which provides nodes for expanding network service areas by integrating wireless backhaul links and access links, Mobility Enhancement including Conditional Handover and Dual Active Protocol Stack (DAPS) Handover, and 2-step Random Access (2-step RACH for NR) which simplifies random access procedures. Standardization is also underway in the field of system architecture / services for 5G baseline architectures (e.g., Service based Architecture, Service based Interface) for incorporating Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC), which provides services based on the location of the terminal.

[0006] When such 5G mobile communication systems are commercialized, connected devices, which are increasing explosively, will be connected to communication networks. Accordingly, it is expected that there will be a need to enhance the functionality and performance of 5G mobile communication systems and to integrate the operation of connected devices. To this end, new research is planned to be conducted on 5G performance improvement and complexity reduction, support for AI services, support for metaverse services, and drone communication using eXtended Reality (XR), Artificial Intelligence (AI), and Machine Learning (ML) to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR).

[0007] Furthermore, the advancement of these 5G mobile communication systems encompasses multi-antenna transmission technologies such as new waveforms to guarantee coverage in the terahertz band of 6G mobile communication technology, Full Dimensional MIMO (FD-MIMO), array antennas, and large-scale antennas; metamaterial-based lenses and antennas to improve terahertz band signal coverage; high-dimensional spatial multiplexing technology using OAM (Orbital Angular Momentum); and Reconfigurable Intelligent Surface (RIS) technology; as well as Full Duplex technology for enhancing frequency efficiency and system networks in 6G mobile communication technology; AI-based communication technologies that realize system optimization by utilizing satellites and AI from the design stage and internalizing end-to-end AI support functions; and the realization of services of complexity exceeding the limits of terminal computing capabilities by utilizing ultra-high-performance communication and computing resources. It could serve as a foundation for the development of next-generation distributed computing technologies.

[0008] With the recent development of 5G / 6G communication systems that take the environment into account, there is a growing need for methods to reduce energy consumption or save energy in communication systems (e.g., terminals, base stations, networks, etc.).

[0009] Based on the discussion above, the present disclosure aims to provide a method and apparatus for managing a CPU (channel state information processing unit) for transmitting and receiving an on-demand SSB (synchronization signal and physical broadcast channel block, or SS / PBCH block) in a wireless communication system.

[0010] A method performed by a user equipment (UE) in a wireless communication system according to one embodiment of the present disclosure comprises: receiving configuration information for an on-demand synchronization signal and physical broadcast channel block (OD-SSB) from a base station; receiving downlink control information (DCI) for triggering semi-persistent channel state information (SP-CSI) from the base station; receiving a medium access control (MAC) control element (CE) for triggering the OD-SSB on a physical downlink shared channel (PDSCH) scheduled by the DCI from the base station; receiving one or more OD-SSBs based on the MAC CE from the base station; and transmitting a channel state information (CSI) report for the one or more OD-SSBs to the base station, wherein the CPU (CSI processing unit) occupation time for the one or more OD-SSBs may be determined from a first time point related to the MAC CE to a second time point in which the CSI report is transmitted.

[0011] A method performed by a base station in a wireless communication system according to one embodiment of the present disclosure comprises: transmitting configuration information for an OD-SSB (on-demand synchronization signal and physical broadcast channel block) to a UE (user equipment); transmitting downlink control information (DCI) to trigger a semi-persistent channel state information (SSP-CSI) to the UE; transmitting a medium access control (MAC) control element (CE) to trigger the OD-SSB on a physical downlink shared channel (PDSCH) scheduled by the DCI to the UE; transmitting one or more OD-SSBs to the UE based on the MAC CE; and receiving a channel state information (CSI) report for the one or more OD-SSBs from the UE, wherein the CPU (CSI processing unit) occupation time for the one or more OD-SSBs may be determined from a first time point related to the MAC CE to a second time point in which the CSI report is transmitted.

[0012] User equipment (UE) according to one embodiment of the present disclosure comprises: at least one transceiver; and at least one processor communicatively coupled to the at least one transceiver; and includes at least one memory communicationly coupled to the at least one processor for storing instructions, wherein the instructions are executed by the at least one processor individually or in any combination, so that the UE: receives configuration information for an OD-SSB (on-demand synchronization signal and physical broadcast channel block) from a base station, receives downlink control information (DCI) from the base station for triggering a semi-persistent channel state information (SP-CSI), receives a medium access control (MAC) control element (CE) from the base station for triggering the OD-SSB on a physical downlink shared channel (PDSCH) scheduled by the DCI, receives one or more OD-SSBs from the base station based on the MAC CE, transmits a channel state information (CSI) report for the one or more OD-SSBs to the base station, and CPU (CSI processing unit) occupation for the one or more OD-SSBs The time can be determined from a first point in time related to the MAC CE to a second point in time when the CSI report is transmitted.

[0013] A base station according to one embodiment of the present disclosure comprises: at least one transceiver; and at least one processor communicatively coupled to the at least one transceiver; and includes at least one memory that is communicationally coupled to the at least one processor and stores instructions, wherein the instructions are executed by the at least one processor individually or in any combination, so that the base station: transmits configuration information for an OD-SSB (on-demand synchronization signal and physical broadcast channel block) to a UE (user equipment), transmits downlink control information (DCI) to the UE for triggering semi-persistent channel state information (SSP-CSI), transmits a medium access control (MAC) control element (CE) to the UE for triggering the OD-SSB on a physical downlink shared channel (PDSCH) scheduled by the DCI, transmits one or more OD-SSBs to the UE based on the MAC CE, receives a channel state information (CSI) report for the one or more OD-SSBs from the UE, and a CPU (CSI processing unit) for the one or more OD-SSBs The occupation time may be determined from a first point in time related to the MAC CE to a second point in time when the CSI report is transmitted.

[0014] One embodiment of the present invention provides a device and a method capable of effectively providing services in a wireless communication system.

[0015] The effects obtainable from the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art to which the present disclosure belongs from the description below.

[0016] FIG. 1 illustrates the basic structure of the time-frequency domain, which is a wireless resource domain in a wireless communication system according to one embodiment of the present disclosure.

[0017] FIG. 2 illustrates a slot structure considered in a wireless communication system according to one embodiment of the present disclosure.

[0018] FIG. 3 illustrates an example of a time domain mapping structure of a synchronization signal and a beam sweeping operation according to one embodiment of the present disclosure.

[0019] FIG. 4 illustrates a synchronization signal block considered in a wireless communication system according to one embodiment of the present disclosure.

[0020] FIG. 5 illustrates various transmission cases of a synchronization signal block in a frequency band below 6 GHz considered in a wireless communication system according to one embodiment of the present disclosure.

[0021] FIG. 6 illustrates transmission cases of a synchronization signal block in a frequency band of 6 GHz or higher considered in a wireless communication system according to one embodiment of the present disclosure.

[0022] FIG. 7 illustrates transmission cases of a synchronization signal block according to a subcarrier interval within 5ms in a wireless communication system according to one embodiment of the present disclosure.

[0023] FIG. 8 illustrates an example explaining demodulation reference signal (DMRS) patterns (type 1 and type 2) used for communication between a base station and a terminal in a wireless communication system according to one embodiment of the present disclosure.

[0024] FIG. 9 illustrates an example of channel estimation using DMRS received from a physical uplink shared channel (PUSCH) in the time band of a wireless communication system according to one embodiment of the present disclosure.

[0025] FIG. 10 illustrates a method for resetting SSB transmission through dynamic signaling of a wireless communication system according to one embodiment of the present disclosure.

[0026] FIG. 11 illustrates a method for resetting the bandwidth part (BWP) and bandwidth (BW) through dynamic signaling of a wireless communication system according to one embodiment of the present disclosure.

[0027] FIG. 12 illustrates a method for resetting discontinuous reception (DRX) through dynamic signaling of a wireless communication system according to one embodiment of the present disclosure.

[0028] FIG. 13 illustrates an example explaining a discontinuous transmission (DTx) method for base station energy saving according to one embodiment of the present disclosure.

[0029] FIG. 14 illustrates an example explaining the operation of a base station according to a gNB wake-up signal (WUS) according to one embodiment of the present disclosure.

[0030] FIG. 15 illustrates an antenna adaptation method for a base station for energy saving of a wireless communication system according to one embodiment of the present disclosure.

[0031] FIG. 16 is a diagram illustrating an example of on-demand SSB operation in a situation where a SCell (secondary cell) is set up for a terminal but is not yet activated, according to one embodiment of the present disclosure.

[0032] FIG. 17 is a diagram illustrating an example of on-demand SSB operation in a situation where an activation instruction for SCell is received according to one embodiment of the present disclosure.

[0033] FIG. 18 is a diagram illustrating an example of a method for securing a CPU for channel reporting when on-demand SSB transmission is directed by a MAC (medium access control)-CE (control element) according to an embodiment of the present disclosure.

[0034] FIG. 19 is a diagram illustrating an example of a method for securing a CPU for channel reporting when on-demand SSB transmission is directed by MAC-CE according to an embodiment of the present disclosure.

[0035] FIG. 20 is a diagram illustrating an example of a method for securing a CPU for channel reporting when on-demand SSB transmission is directed by MAC-CE according to an embodiment of the present disclosure.

[0036] FIG. 21 is a flowchart of the operation of a terminal applying an energy saving method of a wireless communication system according to one embodiment of the present disclosure.

[0037] FIG. 22 is a flowchart of the operation of a base station applying an energy saving method of a wireless communication system according to one embodiment of the present disclosure.

[0038] FIG. 23 is a block diagram of a terminal according to one embodiment of the present disclosure.

[0039] FIG. 24 is a block diagram of a base station according to one embodiment of the present disclosure.

[0040] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0041] In describing the embodiments of the present disclosure below, technical details that are well known in the technical field to which the present disclosure belongs and are not directly related to the present disclosure are omitted. This is intended to convey the essence of the present disclosure more clearly without obscuring it by omitting unnecessary explanations.

[0042] For the same reason, some components in the attached drawings have been exaggerated, omitted, or schematically depicted. Additionally, the dimensions of each component do not entirely reflect their actual dimensions. Identical or corresponding components in each drawing have been assigned the same reference numbers.

[0043] The advantages and features of the present disclosure and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments described below but may be implemented in various different forms. These embodiments are provided merely to ensure that the present disclosure is complete and to fully inform those skilled in the art of the scope of the technical concept to which the present disclosure pertains, and the present disclosure is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components. Furthermore, the terms described below are defined considering their functions in the present disclosure, and these may vary depending on the intentions or conventions of the user or operator. Therefore, their definitions should be based on the content throughout the present specification.

[0044] Hereinafter, the base station is an entity that performs resource allocation for terminals and may be at least one of gNode B, eNode B, Node B, BS (Base Station), wireless access unit, base station controller, or a node on a network. The terminal may include UE (user equipment), MS (mobile station), cellular phone, smartphone, computer, or a multimedia system capable of performing communication functions. In this disclosure, the downlink (DL) refers to the wireless transmission path of a signal transmitted by the base station to the terminal, and the uplink (UL) refers to the wireless transmission path of a signal transmitted by the terminal to the base station.

[0045] In addition, while LTE or LTE-A systems may be described below as examples, embodiments of the present disclosure may also be applied to other communication systems having similar technical backgrounds or channel types. For example, 5th generation mobile communication technologies (5G, new radio, NR) developed after LTE-A may be included, and the 5G below may be a concept that includes existing LTE, LTE-A, and other similar services. Furthermore, the present disclosure may be applied to other communication systems with some modifications made at the discretion of a person with skilled technical knowledge, without significantly departing from the scope of the present disclosure.

[0046] At this point, it will be understood that each block of the process flow diagrams and combinations of the flow diagrams can be executed by computer program instructions. Since these computer program instructions can be loaded into the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, the instructions executed through the processor of the computer or other programmable data processing equipment create means to perform the functions described in the flow diagram block(s). Since these computer program instructions can also be stored in computer-available or computer-readable memory that can be directed toward the computer or other programmable data processing equipment to implement the function in a specific way, the instructions stored in computer-available or computer-readable memory can also produce a manufactured item containing the means of instruction to perform the function described in the flow diagram block(s). Since computer program instructions can be loaded onto a computer or other programmable data processing equipment, instructions that perform a series of operation steps on the computer or other programmable data processing equipment to create a process executed by the computer can also provide steps for executing the functions described in the flowchart block(s).

[0047] Additionally, each block may represent a module, segment, or part of code containing one or more executable instructions for executing a specific logical function(s). It should also be noted that in some alternative execution examples, the functions mentioned in the blocks may occur out of order. For example, two blocks described in succession may actually be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order according to their corresponding functions.

[0048] As used in this disclosure, the term “part” refers to a software or hardware component, such as a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC), and the “part” performs certain roles. However, the “part” is not limited to software or hardware. The “part” may be configured to reside in an addressable storage medium or configured to run one or more processors. Thus, by example, the “part” includes components such as software components, object-oriented software components, class components, and task components, as well as processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and “parts” may be combined into a smaller number of components and “parts” or further separated into additional components and “parts.” In addition, the components and '~parts' may be implemented to utilize one or more CPUs within the device or secure multimedia card. Also, in the embodiment, the '~part' may include one or more processors.

[0049] The methods and devices proposed in the embodiments of the present disclosure below are not limited to each specific embodiment, and may also be utilized as a combination of all or part of one or more embodiments proposed in the disclosure. Accordingly, the embodiments of the present disclosure may be applied with some modifications within the scope of the present disclosure without significantly departing from the scope of the present disclosure, at the judgment of a person skilled in the art.

[0050] Wireless communication systems are evolving from providing early voice-oriented services to broadband wireless communication systems that provide high-speed, high-quality packet data services, such as 3GPP’s HSPA (high speed packet access), LTE (long term evolution or E-UTRA (evolved universal terrestrial radio access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2’s HRPD (high rate packet data), UMB (ultra mobile broadband), and IEEE’s 802.17e communication standards.

[0051] In the LTE system, a representative example of a broadband wireless communication system, the downlink (DL) employs the orthogonal frequency division multiplexing (OFDM) method, and the uplink (UL) employs the single carrier frequency division multiple access (SC-FDMA) method. The uplink refers to a wireless link through which a terminal (hereinafter referred to as user equipment (UE) or terminal) (or mobile station (MS)) transmits data or control signals to a base station (eNode B (eNB) or base station (BS)), and the downlink refers to a wireless link through which a base station transmits data or control signals to a terminal (UE). Furthermore, the aforementioned multiple access method typically ensures that the time-frequency resources to be used to transmit data or control information for each user do not overlap, that is, that orthogonality is established, thereby allowing the data or control information of each user to be distinguished.

[0052] 5G communication systems, which are communication systems following LTE, must support services that simultaneously satisfy various requirements so as to freely reflect the diverse needs of users and service providers. Services considered for 5G communication systems include enhanced mobile broadband (eMBB), massive machine type communication (mMTC), or ultra reliability low latency communication (URLC).

[0053] eMBB aims to provide data transmission speeds that are superior to those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to provide a peak data rate of 20 Gbps in the downlink and 10 Gbps in the uplink from the perspective of a single base station. Furthermore, while providing the peak data rates, the 5G communication system must also provide an increased user-perceived data rate. To satisfy these requirements, improvements in various transmission and reception technologies, including enhanced multi-input multi-output (MIMO) transmission technology, may be required. Additionally, while LTE systems transmit signals using a maximum transmission bandwidth of 20 MHz in the 2 GHz band, 5G communication systems can meet the data transmission speeds required by the 5G communication system by using a frequency bandwidth wider than 20 MHz in frequency bands of 3 to 6 GHz or above 6 GHz.

[0054] Simultaneously, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. To efficiently provide IoT, mMTC requires support for a large number of terminal connections within a cell, improved terminal coverage, enhanced battery life, and reduced terminal costs. Since IoT provides communication functions attached to various sensors and devices, it must be possible to support a large number of terminals within a cell (e.g., 1,000,000 terminals / km²). Furthermore, due to the nature of the service, terminals supporting mMTC are likely to be located in dead zones not covered by cells, such as building basements, thus requiring wider coverage compared to other services provided by 5G communication systems. Terminals supporting mMTC must consist of low-cost devices, and because it is difficult to frequently replace terminal batteries, they require a very long battery life of 10 to 16 years.

[0055] Finally, URLLC is a mission-critical cellular-based wireless communication service. For example, consider services used for remote control of robots or machinery, industrial automation, unmanned aerial vehicles, remote health care, or emergency alerts. Therefore, the communication provided by URLLC must offer very low latency and very high reliability. For instance, services supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds and simultaneously meet the requirement of a packet error rate of 10^-5 or less. Consequently, for services supporting URLLC, 5G systems must provide a transmit time interval (TTI) smaller than for other services and simultaneously allocate wide resources in the frequency band to ensure the reliability of the communication link.

[0056] Three services of a 5G communication system (hereinafter interchangeable with 5G systems), namely eMBB, URLLC, and mMTC, can be multiplexed and transmitted within a single system. To satisfy the different requirements of each service, different transmission and reception techniques and transmission and reception parameters may be used between the services.

[0057] The frame structure of a 5G system will be described in more detail below with reference to the drawings. For convenience of explanation, the wireless communication system to which the present disclosure applies will be described below using the configuration of a 5G system as an example; however, the embodiments of the present disclosure may be applied in the same or similar manner to systems of 5G or higher or other communication systems to which the present disclosure is applicable.

[0058] FIG. 1 illustrates the basic structure of the time-frequency domain, which is a wireless resource domain in a wireless communication system according to one embodiment of the present disclosure.

[0059] In FIG. 1, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. In the time and frequency domains, the basic unit of a resource is a resource element (RE, 101), which can be defined as one Orthogonal Frequency Division Multiplexing (OFDM) symbol (or Discrete Fourier Transform Spread OFDM) symbol) (102) on the time axis and one subcarrier (103) on the frequency axis. In the frequency domain, the number of subcarriers per resource block (RB) is indicated. (For example, 12) consecutive REs can form a single resource block (104). Additionally, representing the number of symbols per subframe according to a set value μ for subcarrier spacing in the time domain. A number of consecutive OFDM symbols can form a subframe (110).

[0060] FIG. 2 illustrates a slot structure considered in a wireless communication system according to one embodiment of the present disclosure.

[0061] FIG. 2 illustrates an example of a slot structure comprising a frame (200), a subframe (201), and slots (202, 203). One frame (200) may be defined as 10 ms. One subframe (201) may be defined as 1 ms, and thus one frame (200) may consist of a total of 10 subframes (201). One slot (202, 203) may be defined as 14 OFDM symbols (i.e., the number of symbols per slot ( ))=14). One subframe (201) may be composed of one or more slots (202, 203), and the number of slots (202, 203) per one subframe (201) may vary depending on μ (204 or 205), which is a setting value for the subcarrier space (SCS).

[0062] The slot structure for cases where the subcarrier spacing setting value is μ=0 (204) and μ=1 (205) is illustrated. When μ=0 (204), one subframe (201) may be composed of one slot (202), and when μ=1 (205), one subframe (201) may be composed of two slots (e.g., including slot (203)). That is, depending on the setting value μ for the subcarrier spacing, the number of slots per subframe ( )) may vary, and accordingly, the number of slots per frame ( ) may vary. For example, depending on the setting μ for each subcarrier interval. and It can be defined by the following [Table 1].

[0063]

[0064] In a 5G wireless communication system, a synchronization signal block (SSB, which may be used interchangeably with an SS block or an SS / PBCH block) may be transmitted for the initial connection of a terminal, and the synchronization signal block may include a PSS (primary synchronization signal), an SSS (secondary synchronization signal), and a PBCH (physical broadcast channel).

[0065] In the initial access phase, when the terminal connects to the system, the terminal can first obtain downlink time and frequency domain synchronization from the synchronization signal and acquire the cell identity through a cell search. The synchronization signal may include PSS and SSS. The terminal can then receive a PBCH transmitting a Master Information Block (MIB) from the base station to obtain system information related to transmission and reception, such as system bandwidth or related control information, as well as basic parameter values. Based on this information, the terminal can obtain the System Information Block (SIB) by performing decoding on the Physical Downlink Control Channel (PDCCH) and Physical Downlink Shared Channel (PDSCH). Subsequently, the terminal can initially connect to the network by exchanging identification information between the base station and the terminal through a random access phase and undergoing registration and authentication steps. Additionally, the terminal can obtain cell-common transmission and reception control information by receiving the System Information Block (SIB) transmitted by the base station. The above cell common transmission and reception control information may include random access control information, paging control information, and common control information for various physical channels.

[0066] The synchronization signal serves as a reference for cell search, and subcarrier spacing can be applied for each frequency band to suit channel environments such as phase noise. In the case of data channels or control channels, as described above, subcarrier spacing may be applied differently depending on the service type to support various services.

[0067] FIG. 3 illustrates an example of a time domain mapping structure of a synchronization signal and a beam sweeping operation according to one embodiment of the present disclosure.

[0068] For the purpose of explanation, the following components may be defined.

[0069] - PSS (Primary Synchronization Signal): A signal that serves as the reference for DL ​​(downlink) time / frequency synchronization and provides some cell ID information.

[0070] - SSS (Secondary Synchronization Signal): Serves as a reference for DL ​​time / frequency synchronization and provides some of the remaining information, including the cell ID. Additionally, it can serve as a reference signal for PBCH demodulation.

[0071] - PBCH (Physical Broadcast Channel): Provides the Master Information Block (MIB), which is essential system information required for the transmission and reception of the terminal's data and control channels. The said essential system information may include control information related to the search space representing wireless resource mapping information of the control channel, scheduling control information for a separate data channel transmitting system information, and information such as the System Frame Number (SFN), which is a frame-unit index serving as a timing reference.

[0072] - SS / PBCH Block (Synchronization Signal / PBCH Block or SSB): An SS / PBCH block consists of N OFDM symbols and is formed by a combination of PSS, SSS, PBCH, etc. In systems where beam sweeping technology is applied, the SS / PBCH block is the minimum unit to which beam sweeping is applied. In a 5G system, N can be 4. A base station can transmit up to L SS / PBCH blocks, and the L SS / PBCH blocks are mapped within a half frame (0.5ms). The L SS / PBCH blocks are repeated periodically in units of a predetermined period P. The base station can notify the terminal of the period P through signaling. If there is no separate signaling for the period P, the terminal applies a pre-agreed default value.

[0073] Referring to FIG. 3, beam sweeping can be applied in units of SS / PBCH blocks over time. In the case of Terminal 1 (305), at time t1 (301), it receives an SS / PBCH block using a beam radiated in the direction of #d0 (303) by beamforming applied to SS / PBCH block #0. Then, at time t2 (302), Terminal 2 (306) receives an SS / PBCH block using a beam radiated in the direction of #d4 (304) by beamforming applied to SS / PBCH block #4. The terminal can obtain an optimal synchronization signal through a beam radiated from the base station in the direction where the terminal is located. For example, it may be difficult for Terminal 1 (305) to obtain time / frequency synchronization and essential system information from an SS / PBCH block through a beam radiated in the direction of #d4 (304), which is far from the location of Terminal 1 (305).

[0074] In addition to the initial connection procedure, the terminal may also receive SS / PBCH blocks to determine whether the radio link quality of the current cell is maintained above a certain level. Furthermore, during the handover procedure in which the terminal moves the connection from the current cell to an adjacent cell, the terminal may receive SS / PBCH blocks of the adjacent cell to determine the radio link quality of the adjacent cell and to obtain time / frequency synchronization with the adjacent cell.

[0075] Below, the cell initial connection operation procedure of a 5G wireless communication system will be explained in more detail with reference to the drawings.

[0076] Synchronization signals serve as reference signals for cell search and can be transmitted with subcarrier spacing applied to suit the channel environment (e.g., phase noise) for each frequency band. 5G base stations can transmit multiple synchronization signal blocks depending on the number of analog beams to be operated. For example, PSS and SSS can be mapped and transmitted across 12 RBs, while PBCH can be mapped and transmitted across 24 RBs. The structure of synchronization signal and PBCH transmission in a 5G communication system is described below.

[0077] FIG. 4 illustrates a synchronization signal block considered in a wireless communication system according to one embodiment of the present disclosure.

[0078] Referring to FIG. 4, the synchronization signal block (SS block, SSB) (400) may include PSS (401), SSS (403), and PBCH (Physical Broadcast Channel) (402).

[0079] The synchronization signal block (400) can be mapped to four OFDM symbols (404) in the time axis. The PSS (401) and SSS (403) can be transmitted at 12 RB (405) in the frequency axis and at the first and third OFDM symbols in the time axis, respectively. In a 5G system, for example, a total of 1008 different cell IDs can be defined. Depending on the physical cell ID (PCI) of the cell, the PSS (401) can have three different values, and the SSS (403) can have 336 different values. The terminal can obtain one of the 1008 cell IDs (336 x 3 = 1008) by detecting the PSS (401) and SSS (403) and their combinations. This can be expressed by the following [Equation 1].

[0080] [Mathematical Formula 1]

[0081]

[0082] Here can be estimated from SSS(403) and can have a value between 0 and 335. can be estimated from PSS (401) and can have a value between 0 and 2. The terminal class The cell ID is a combination of The value can be estimated.

[0083] PBCH (402) can be transmitted from a resource containing 6 RBs (407, 408) on each side excluding 12 RBs (405), with 24 RBs (406) in the frequency axis and SSS (403) in the 2nd to 4th OFDM symbols of the SS block in the time axis being transmitted. PBCH (402) may include a PBCH payload and a PBCH DMRS (demodulation reference signal), and various system information called MIB may be transmitted in the PBCH payload. For example, the MIB may include information such as [2] below.

[0084]

[0085] - Synchronization signal block information: The frequency domain offset of the synchronization signal block can be indicated through the 4-bit ssb-SubcarrierOffset within the MIB. The index of the synchronization signal block containing the PBCH can be obtained indirectly through PBCH DMRS and decoding of the PBCH. In one embodiment, in a frequency band below 6 GHz, 3 bits obtained through decoding of the PBCH DMRS indicate the synchronization signal block index, and in a frequency band above 6 GHz, a total of 6 bits, including 3 bits obtained through decoding of the PBCH DMRS and 3 bits included in the PBCH payload obtained from PBCH decoding, can indicate the synchronization signal block index containing the PBCH.

[0086] - PDCCH (physical downlink control channel) configuration information: The subcarrier spacing of the common downlink control channel can be indicated via a 1-bit (subCarrierSpacingCommon) within the MIB, and the time-frequency resource configuration information of the CORESET (control resource set) and search space (SS) of Identifier (ID) 0 can be indicated via an 8-bit (pdcch-ConfigSIB1). The CORESET of Identifier 0 can be referred to as controlResourceSetZero, and the search space of Identifier 0 can be referred to as searchspaceZero. In this disclosure, for convenience, the CORESET of Identifier 0 will be referred to as CORESET#0 or control space#0, and the search space of Identifier 0 will be referred to as search space#0. During the initial connection of the cell, the terminal can receive frequency resources indicating the number of RBs of CORESET#0, which includes the common search space set of Type0-PDCCH CSS set, and time resources indicating the number of OFDM symbols, etc., from the pdcch-ConfigSIB1.

[0087] - SFN (system frame number): Within the MIB, 6 bits (systemFrameNumber) can be used to indicate part of the SFN. The 4 bits of the SFN's LSB (Least Significant Bit) are included in the PBCH payload, and the terminal can obtain them indirectly through PBCH decoding.

[0088] - Timing information within a radio frame: With the synchronization signal block index described above and the 1-bit (half frame) obtained through PBCH decoding included in the PBCH payload, the terminal can indirectly check whether the synchronization signal block was transmitted in the first or second half frame of the radio frame.

[0089] Since the transmission bandwidth (12 RB (405)) of PSS (401) and SSS (403) and the transmission bandwidth (24 RB (406)) of PBCH (402) are different, in the first OFDM symbol where PSS (401) is transmitted within the transmission bandwidth of PBCH (402), there are 6 RBs (407, 408) on both sides excluding the 12 RB in the middle where PSS (401) is transmitted, and the area may be used to transmit other signals or be empty.

[0090] - Cell connection permission information: A 1-bit (cellBarred) within the MIB may indicate whether camping to a cell is permitted. Additionally, if camping to the cell with the best reception quality is prohibited (barred), a 1-bit (intraFreqReselection) within the MIB may indicate whether cell reselection to an intra-frequency cell is permitted.

[0091] Synchronization signal blocks can be transmitted using the same analog beam. For example, PSS (401), SSS (403), and PBCH (402) can all be transmitted on the same beam. Since analog beams have the characteristic that they cannot be applied differently in the frequency axis, the same analog beam can be applied to all frequency axis RBs within a specific OFDM symbol to which a specific analog beam is applied. For example, four OFDM symbols in which PSS (401), SSS (403), and PBCH (402) are transmitted can all be transmitted on the same analog beam.

[0092] FIG. 5 illustrates various transmission cases of a synchronization signal block in a frequency band below 6 GHz considered in a wireless communication system according to one embodiment of the present disclosure.

[0093] Referring to FIG. 5, in a 5G communication system, in a frequency band of 6 GHz or lower (or FR1 (frequency range 1), e.g., 410 MHz-7125 MHz), a subcarrier spacing (SCS) of 15 kHz (520) and a subcarrier spacing (SCS) of 30 kHz (530, 540) may be used for the transmission of a synchronization signal block. In the 15 kHz subcarrier spacing (520), there is one transmission case for the synchronization signal block (e.g., Case #1 (501)), and in the 30 kHz subcarrier spacing (530, 540), there may be two transmission cases for the synchronization signal block (e.g., Case #2 (502) and Case #3 (503)).

[0094] In case #1 (501) at a subcarrier interval of 15 kHz (520) in FIG. 5, up to two synchronization signal blocks can be transmitted within a time of 1 ms (504) (or corresponding to the length of one slot if one slot consists of 14 OFDM symbols). In an example of FIG. 5, synchronization signal block #0 (507) and synchronization signal block #1 (508) are shown. For example, synchronization signal block #0 (507) can be mapped to four consecutive symbols starting from the 3rd OFDM symbol, and synchronization signal block #1 (508) can be mapped to four consecutive symbols starting from the 9th OFDM symbol.

[0095] Different analog beams may be applied to synchronization signal block #0 (507) and synchronization signal block #1 (508). Also, the same beam may be applied to all 3rd to 6th OFDM symbols mapped to synchronization signal block #0 (507), and the same beam may be applied to all 9th ​​to 12th OFDM symbols mapped to synchronization signal block #1 (508). For the 7th, 8th, 13th, and 14th OFDM symbols that are not mapped to synchronization signal blocks, the analog beam to be used may be freely determined at the discretion of the base station.

[0096] In case #2 (502) at a subcarrier interval of 30 kHz (530) in FIG. 5, up to two synchronization signal blocks can be transmitted within a time of 0.5 ms (505) (or corresponding to the length of one slot if one slot consists of 14 OFDM symbols), and accordingly, up to four synchronization signal blocks can be transmitted within a time of 1 ms (or corresponding to the length of two slots if one slot consists of 14 OFDM symbols). In one example of FIG. 5, a case is illustrated in which synchronization signal block #0 (509), synchronization signal block #1 (510), synchronization signal block #2 (511), and synchronization signal block #3 (512) are transmitted within a time of 1 ms (i.e., two slots). Synchronization signal block #0 (509) and synchronization signal block #1 (510) can be mapped starting from the 5th OFDM symbol and 9th OFDM symbol of the first slot, respectively, and synchronization signal block #2 (511) and synchronization signal block #3 (512) can be mapped starting from the 3rd OFDM symbol and 7th OFDM symbol of the second slot, respectively.

[0097] Different analog beams may be applied to each of the synchronization signal block #0 (509), synchronization signal block #1 (510), synchronization signal block #2 (511), and synchronization signal block #3 (512). Additionally, the same analog beam may be applied to each of the 5th to 8th OFDM symbols in the first slot where synchronization signal block #0 (509) is transmitted, the 9th to 12th OFDM symbols in the first slot where synchronization signal block #1 (510) is transmitted, the 3rd to 6th symbols in the second slot where synchronization signal block #2 (511) is transmitted, and the 7th to 10th symbols in the second slot where synchronization signal block #3 (512) is transmitted. For OFDM symbols where the synchronization signal block is not mapped, the analog beam to be used may be freely determined at the discretion of the base station.

[0098] In case #3 (503) at a subcarrier interval of 30 kHz (540) in FIG. 5, up to two synchronization signal blocks can be transmitted within a time of 0.5 ms (506) (or corresponding to the length of one slot if one slot consists of 14 OFDM symbols), and accordingly, up to four synchronization signal blocks can be transmitted within a time of 1 ms (or corresponding to the length of two slots if one slot consists of 14 OFDM symbols). In one example of FIG. 5, synchronization signal block #0 (513), synchronization signal block #1 (514), synchronization signal block #2 (515), and synchronization signal block #3 (516) are shown being transmitted within a time of 1 ms (i.e., two slots). Synchronization signal block #0 (513) and synchronization signal block #1 (514) can be mapped starting from the 3rd OFDM symbol and 9th OFDM symbol of the first slot, respectively, and synchronization signal block #2 (515) and synchronization signal block #3 (516) can be mapped starting from the 3rd OFDM symbol and 9th OFDM symbol of the second slot, respectively.

[0099] Different analog beams may be used for each of the synchronization signal block #0 (513), synchronization signal block #1 (514), synchronization signal block #2 (515), and synchronization signal block #3 (516). As described in the examples above, the same analog beam may be used for all four OFDM symbols in which each synchronization signal block is transmitted, and for OFDM symbols in which the synchronization signal block is not mapped, the choice of which beam to use may be freely determined by the base station.

[0100] FIG. 6 illustrates transmission cases of a synchronization signal block in a frequency band of 6 GHz or higher considered in a wireless communication system according to one embodiment of the present disclosure.

[0101] Referring to FIG. 6, in a wireless communication system, in a frequency band of 6 GHz or higher (or FR2 (frequency range 2), e.g., 24250 MHz-52000 MHz), a subcarrier interval of 120 kHz (630), as in the example of Case #4 (610), and a subcarrier interval of 240 kHz (640), as in the example of Case #5 (620), can be used for the transmission of synchronization signal blocks.

[0102] In case #4 (610) of a subcarrier interval of 120 kHz (630), up to four synchronization signal blocks can be transmitted within a time of 0.25 ms (601) (or, if one slot consists of 14 OFDM symbols, the length of two slots). In an example of FIG. 6, a case is illustrated in which synchronization signal block #0 (603), synchronization signal block #1 (604), synchronization signal block #2 (605), and synchronization signal block #3 (606) are transmitted within 0.25 ms (i.e., two slots). Synchronization signal block #0 (603) and synchronization signal block #1 (604) can each be mapped to four consecutive symbols starting from the 5th OFDM symbol of the first slot and to four consecutive symbols starting from the 9th OFDM symbol, and synchronization signal block #2 (605) and synchronization signal block #3 (606) can each be mapped to four consecutive symbols starting from the 3rd OFDM symbol of the second slot and to four consecutive symbols starting from the 7th OFDM symbol.

[0103] As described in the above embodiment, different analog beams may be used for each of the synchronization signal block #0 (603), synchronization signal block #1 (604), synchronization signal block #2 (605), and synchronization signal block #3 (606). In addition, the same analog beam may be used for all four OFDM symbols transmitted by each synchronization signal block, and for OFDM symbols that are not mapped to the synchronization signal block, the choice of which beam to use may be freely determined by the base station.

[0104] In case #5 (620) at a subcarrier interval of 240 kHz (640), up to 8 synchronization signal blocks can be transmitted within a time of 0.25 ms (602) (or corresponding to a length of 4 slots if 1 slot consists of 14 OFDM symbols). In an example of FIG. 6, a case is illustrated in which synchronization signal block #0 (607), synchronization signal block #1 (608), synchronization signal block #2 (609), synchronization signal block #3 (610), synchronization signal block #4 (611), synchronization signal block #5 (612), synchronization signal block #6 (613), and synchronization signal block #7 (614) are transmitted within 0.25 ms (i.e., 4 slots).

[0105] Synchronization signal block #0 (607) and synchronization signal block #1 (608) can each be mapped to four consecutive symbols starting from the 9th OFDM symbol of the first slot and to four consecutive symbols starting from the 13th OFDM symbol, and synchronization signal block #2 (609) and synchronization signal block #3 (610) can each be mapped to four consecutive symbols starting from the 3rd OFDM symbol of the second slot and to four consecutive symbols starting from the 7th OFDM symbol, and synchronization signal block #4 (611), synchronization signal block #5 (612), and synchronization signal block #6 (613) can each be mapped to four consecutive symbols starting from the 5th OFDM symbol of the third slot, to four consecutive symbols starting from the 9th OFDM symbol and to four consecutive symbols starting from the 13th OFDM symbol, and synchronization signal block #7 (614) can be mapped to the 3rd OFDM symbol of the fourth slot It can be mapped to four consecutive symbols starting from the symbol.

[0106] As described in the above embodiment, different analog beams may be used for each of the synchronization signal block #0 (607), synchronization signal block #1 (608), synchronization signal block #2 (609), synchronization signal block #3 (610), synchronization signal block #4 (611), synchronization signal block #5 (612), synchronization signal block #6 (613), and synchronization signal block #7 (614). In addition, the same analog beam may be used for all four OFDM symbols transmitted by each synchronization signal block, and for OFDM symbols that are not mapped to the synchronization signal block, the choice of which beam to use may be freely determined by the base station.

[0107] FIG. 7 illustrates transmission cases of a synchronization signal block according to a subcarrier interval within 5ms in a wireless communication system according to one embodiment of the present disclosure.

[0108] Referring to FIG. 7, in a 5G communication system, a synchronization signal block can be transmitted periodically in units of, for example, a time interval (710) of 5 ms (corresponding to 5 subframes or half frames).

[0109] In the frequency band below 3 GHz, up to 4 synchronization signal blocks can be transmitted within a time of 5 ms (710). In the frequency band between 3 GHz and 6 GHz, up to 8 synchronization signal blocks can be transmitted. In the frequency band above 6 GHz, up to 64 synchronization signal blocks can be transmitted. As described above, subcarrier spacings of 15 kHz and 30 kHz can be used in frequencies below 6 GHz.

[0110] In the example of FIG. 7, in case #1 (501) with a subcarrier interval of 15 kHz consisting of one slot of FIG. 5, a synchronization signal block can be mapped to the first and second slots in the frequency band below 3 GHz, allowing up to 4 (721) to be transmitted, and in the frequency band above 3 GHz and below 6 GHz, a synchronization signal block can be mapped to the first, second, third, and fourth slots, allowing up to 8 (722) to be transmitted. In case #2 (502) or case #3 (503) with a subcarrier interval of 30 kHz consisting of two slots of FIG. 5, a synchronization signal block can be mapped starting from the first slot in the frequency band below 3 GHz, allowing up to 4 (731, 741) to be transmitted, and in the frequency band above 3 GHz and below 6 GHz, a synchronization signal block can be mapped starting from the first and third slots, allowing up to 8 (732, 742) to be transmitted.

[0111] Subcarrier spacing of 120 kHz and 240 kHz can be used at frequencies above 6 GHz. In the example of FIG. 7, in case #4 (610) at a subcarrier spacing of 120 kHz consisting of two slots of FIG. 6, synchronization signal blocks in the frequency band above 6 GHz can be mapped starting from the 1st, 3rd, 5th, 7th, 11th, 13th, 15th, 17th, 21st, 23rd, 25th, 27th, 31st, 33rd, 35th, and 37th slots, so that up to 64 (751) can be transmitted. In the example of FIG. 7, in case #5 (620) at a subcarrier interval of 240 kHz consisting of 4 slots of FIG. 6, synchronization signal blocks in the over 6 GHz frequency band can be mapped starting from the 1st, 5th, 9th, 13th, 21st, 25th, 29th, and 33rd slots, so that up to 64 (761) can be transmitted.

[0112] The terminal can obtain SIB1 or SIBx (other SIBs excluding SIB1) after performing decoding of PDCCH and PDSCH based on system information contained in the received MIB. SIB1 may include at least one of uplink cell bandwidth-related information, random access parameters, paging parameters, or parameters related to uplink power control.

[0113] Generally, a terminal can establish a wireless link with a network through a random access procedure based on network synchronization and system information acquired during the cell search process. Random access may utilize contention-based or contention-free methods. When a terminal performs cell selection and re-selection during the initial connection phase of a cell, a contention-based random access method may be used, for example, to transition from the RRC (radio resource control)_IDLE state to the RRC_CONNECTED state. Contention-free random access may be used to reset uplink synchronization when downlink data arrives, in the case of a handover, or for location measurement. Table 3 below illustrates the conditions (events) under which the random access procedure is triggered in a 5G system.

[0114]

[0115] Next, we will explain in detail the Bandwidth Part (BWP) settings in the 5G communication system.

[0116] In a 5G communication system, the base station can set one or more bandwidth portions for the terminal, and for each bandwidth portion, it can set the information included in [Table 4] below.

[0117]

[0118] In addition to the above configuration information, various parameters related to bandwidth portions may be configured for the terminal. These information may be transmitted by the base station to the terminal via upper-layer signaling, such as RRC signaling. Among the one or more configured bandwidth portions, at least one bandwidth portion may be activated. Whether a configured bandwidth portion is activated may be transmitted quasi-statically from the base station to the terminal via RRC signaling or dynamically via DCI (downlink control information).

[0119] Before establishing an RRC connection, the terminal can receive an Initial Bandwidth Part (Initial BWP) for initial connection from the base station via MIB or SIB1.

[0120] To explain specifically regarding the configuration of Control Area #0, Search Area #0, and the initial bandwidth portion, the terminal can receive configuration information for Control Area #0 and Search Area #0 through the MIB during the initial connection phase, through which a PDCCH can be transmitted to receive system information required for initial connection (Remaining System Information; which may correspond to RMSI or System Information Block 1; SIB1). The Control Area and Search Area configured by the MIB can each be considered as Identifier (ID) 0. The base station can notify the terminal of configuration information, such as frequency allocation information, time allocation information, and numerology, for Control Area #0 through the MIB. Additionally, the base station can notify the terminal of configuration information regarding the monitoring period and occasion for Control Area #0, that is, configuration information for Search Area #0, through the MIB.

[0121] In the method for setting the initial bandwidth part described above, terminals prior to RRC connection (Connected) can receive configuration information for the initial bandwidth part through the MIB during the initial connection phase. More specifically, the terminal can receive a control area (CORESET) from the PBCH MIB for a downlink control channel through which a DCI for scheduling SIBs can be transmitted. The bandwidth of the control area set by the MIB can be considered as the initial bandwidth part, and through the configured initial bandwidth part, the terminal can receive the PDSCH through which SIBs are transmitted. In addition to receiving SIBs, the initial bandwidth part may also be utilized for other system information (OSI), paging, and random access.

[0122] The following describes a method for setting measurement times for Radio Resource Management (RRM) based on synchronization signal blocks (SS blocks or SSB) of 5G wireless communication systems.

[0123] The terminal receives the MeasObjectNR of MeasObjectToAddModList as a setting for SSB-based intra / inter-frequency measurements and CSI-RS (channel state information-reference signal)-based intra / inter-frequency measurements through upper layer signaling. For example, MeasObjectNR can be configured as shown in [Table 4-1] below.

[0124] [Table 4-1]

[0125]

[0126] The terms in [Table 4-1] can perform the following functions, but are not limited thereto.

[0127] -ssbFrequency: You can set the frequency of the synchronization signal associated with MeasObjectNR.

[0128] -ssbSubcarrierSpacing: Sets the subcarrier spacing of the SSB. FR1 can only be applied to 15 kHz or 30 kHz, and FR2 to 120 kHz or 240 kHz.

[0129] -smtc1: Represents the SS / PBCH block measurement timing configuration. It allows you to set the primary measurement timing configuration and configure the timing offset and duration for the SSB.

[0130] You can configure the secondary measurement timing configuration for the SSB associated with the MeasObjectNR having the PCI listed in -smtc2:pci-List.

[0131] In addition to this, it can be configured through other higher-level signaling, for example, SMTC (SS / PBCH block measurement timing configuration) can be configured to the terminal through reconfigurationWithSync for intra-frequency, inter-frequency, and inter-RAT cell reselection, or for NR PSCell change and NR PCell change, and SMTC can also be configured to the terminal through SCellConfig for NR SCell addition.

[0132] The terminal can set the first SMTC according to periodicityAndOffset (providing Periodicity and Offset) through smtc1 set via upper layer signaling for SSB measurement. In one embodiment, the first subframe of each SMTC occasion can be started in a subframe of SpCell and a system frame number (SFN) satisfying the conditions of [Table 5] below.

[0133]

[0134] If smtc2 is configured, for the cells indicated by the pci-List value of smtc2 within the same MeasObjectNR, the terminal may configure additional SMTCs according to the periodicity of the configured smtc2 and the offset and duration of smtc1. In addition, the terminal may configure smtcs and measure SSBs through smtc3list for smtc2-LP (with long periodicity) and IAB-MT (integrated access and backhaul - mobile termination) for the same frequency (e.g., frequencies for intra-frequency cell reselection) or different frequencies (e.g., frequencies for inter-frequency cell reselection). In one embodiment, the terminal may not consider SSBs transmitted in subframes other than the SMTC occasion for SSB-based RRM measurement at the configured ssbFrequency.

[0135] Base stations can utilize various multi-TRP (transmit / receive point or transmission / reception point) operation methods depending on the serving cell configuration and physical cell identifier (PCI) configuration. Among these, when two TRPs located at a physically separated distance have different PCIs, there can be two methods for operating the two TRPs.

[0136] [Operation Method 1]

[0137] Two TRPs with different PCIs can be operated in a 2-serving cell configuration.

[0138] The base station can configure channels and signals transmitted from different TRPs to be included within different serving cell configurations through [Operation Method 1]. That is, each TRP has an independent serving cell configuration, and the frequency band values ​​FrequencyInfoDL indicated by DownlinkConfigCommon within each serving cell configuration may indicate at least some overlapping bands. Since the above multiple TRPs operate based on multiple ServCellIndexes (e.g., ServCellIndex #1 and ServCellIndex #2), it is possible for each TRP to use a separate PCI. That is, the base station can allocate one PCI per ServCellIndex.

[0139] In this case, if multiple SSBs are transmitted from TRP 1 and TRP 2, the SSBs have different PCIs (e.g., PCI #1 and PCI #2), and the base station can map the PCI corresponding to each TRP by appropriately selecting the value of ServCellIndex indicated by the cell parameter in QCL-Info, and designate the SSB transmitted from either TRP 1 or TRP 2 as the source reference RS of the QCL configuration information. However, since this configuration applies a single serving cell configuration that can be used for the terminal's carrier aggregation (CA) to multiple TRPs, there is a problem of limiting the degree of freedom of the CA configuration or increasing the signaling burden.

[0140] [Operation Method 2]

[0141] Two TRPs with different PCIs can be operated in a single serving cell configuration.

[0142] Through [Operation Method 2], the base station can configure channels and signals transmitted from different TRPs through a single serving cell configuration. Since the terminal operates based on a single ServCellIndex (e.g., ServCellIndex #1), it is impossible for it to recognize the PCI assigned to the second TRP (e.g., PCI #2). [Operation Method 2] may have greater freedom in CA configuration compared to the aforementioned [Operation Method 1], but if multiple SSBs are transmitted from TRP 1 and TRP 2, the SSBs will have different PCIs (e.g., PCI #1 and PCI #2), and the base station may be unable to map the PCI of the second TRP (e.g., PCI #2) through the ServCellIndex indicated by the cell parameter in the QCL (quasi-colocation)-Info. The base station may only be able to designate the SSB transmitted from TRP 1 as the source reference RS of the QCL configuration information, and it may be impossible to designate the SSB transmitted from TRP 2.

[0143] As described above, [Operation Method 1] can perform multi-TRP operation for two TRPs with different PCIs through additional serving cell settings without additional specification support, but [Operation Method 2] can operate based on the following additional terminal capability reports and base station configuration information.

[0144] Regarding terminal capability reporting for [Operation Method 2]

[0145] - The terminal can report to the base station via terminal capability that configuration for the serving cell's PCI and other additional PCIs is possible through upper-layer signaling from the base station. Such terminal capability may include two independent numbers, X1 and X2, or each X1 and X2 may be reported as an independent terminal capability.

[0146] - X1 represents the maximum number of additional PCIs that can be configured for the terminal, and the PCI may differ from the PCI of the serving cell; in this case, it refers to a situation where the time domain position and periodicity of the SSB corresponding to the additional PCI are the same as those of the serving cell's SSB.

[0147] - X2 represents the maximum number of additional PCIs that can be configured for the terminal, and in this case, the PCI may differ from the PCI of the serving cell. In this case, the time domain position and periodicity of the SSB corresponding to the additional PCI may differ from the SSB corresponding to the PCI reported as X1.

[0148] - By definition, PCIs corresponding to the values ​​reported as X1 and X2 cannot be set simultaneously.

[0149] - The values ​​reported as X1 and X2 through the terminal capability report can each have one integer value from 0 to 7.

[0150] - The values ​​reported as X1 and X2 may differ from the values ​​reported in FR1 and FR2.

[0151] Regarding upper layer signaling settings for [Operation Method 2]

[0152] - Based on the terminal capability report described above, the terminal may receive an upper layer signaling, SSB-MTCAdditionalPCI-r17, from the base station, and the upper layer signaling may include at least a plurality of additional PCIs having values ​​different from the serving cell, an SSB transmission power corresponding to each additional PCI, and an ssb-PositionInBurst corresponding to each additional PCI, and the maximum number of additional PCIs that can be set may be 7.

[0153] - As an assumption regarding the SSB corresponding to an additional PCI of a different value from the serving cell, the terminal may be assumed to have the same center frequency, subcarrier spacing, and subframe number offset as the SSB of the serving cell.

[0154] - The terminal may assume that the reference RS (e.g., SSB or CSI-RS) corresponding to the PCI of the serving cell is always connected to an active TCI state, and in the case of additionally configured PCIs having values ​​different from the serving cell, when there is one or more PCIs, it may assume that only one of those PCIs is connected to an active TCI state.

[0155] - If a terminal is configured with two different coresetPoolIndexes, and a reference RS corresponding to a serving cell PCI is connected to one or more active TCI states, and a reference RS corresponding to an additionally configured PCI having a different value from the serving cell is connected to one or more active TCI states, the terminal can expect that the active TCI state(s) connected to the serving cell PCI are connected to one of the two coresetPoolIndexes, and the active TCI state(s) connected to the additionally configured PCI having a different value from the serving cell are connected to the other coresetPoolIndex.

[0156] The terminal capability reporting and upper layer signaling of the base station for the above-described [Operation Method 2] can set an additional PCI with a value different from the PCI of the serving cell. If the above setting does not exist, the SSB corresponding to the additional PCI with a value different from the PCI of the serving cell, which cannot be designated as a source reference RS, can be used to designate it as the source reference RS of the QCL setting information. Furthermore, unlike the SSB that can be set for use in purposes such as RRM, mobility, or handover, such as the setting information for the SSB that can be set within the upper layer signaling smtc1 and smtc2, it can be used to serve as a QCL source RS to support multiple TRP operations having different PCIs.

[0157] Next, we will explain in detail the demodulation reference signal (DMRS), which is one of the reference signals in the 5G system.

[0158] A DMRS may consist of multiple DMRS ports, and each port maintains orthogonality using CDM (code division multiplexing) or FDM (frequency division multiplexing) to prevent interference with one another. However, the term DMRS may be expressed using other terms depending on the user's intent and the purpose of use of the reference signal. The term DMRS is provided merely as a specific example to facilitate the explanation of the technical content of this disclosure and to aid in understanding the disclosure, and is not intended to limit the scope of this disclosure. In other words, it is obvious to those skilled in the art that the technical concept of this disclosure can be implemented with any reference signal.

[0159] FIG. 8 illustrates an example explaining DMRS patterns (type 1 and type 2) used for communication between a base station and a terminal in a wireless communication system according to one embodiment of the present disclosure.

[0160] Two DMRS patterns can be supported in 5G systems.

[0161] Referring to FIG. 8, DMRS type 1 (801, 802) is illustrated, specifically 1 symbol pattern (801) and 2 symbol pattern (802). DMRS type 1 (801, 802) is a DMRS pattern with a comb 2 structure and can be composed of two CDM groups (CDM group 0, CDM group 1), and different CDM groups can be FDM.

[0162] In 1 symbol pattern (801), frequency-phase CDM is applied to the same CDM group to distinguish two DMRS ports, thus allowing a total of four orthogonal DMRS ports to be configured. 1 symbol pattern (801) may include DMRS port IDs mapped to each CDM group (DMRS port IDs for the downlink may be indicated by the illustrated number + 1000). In 2 symbol pattern (802), time / frequency-phase CDM is applied to the same CDM group to distinguish four DMRS ports, thus allowing a total of eight orthogonal DMRS ports to be configured. 2 symbol pattern (802) may include DMRS port IDs mapped to each CDM group (DMRS port IDs for the downlink may be indicated by the illustrated number + 1000).

[0163] Referring to FIG. 8, DMRS type 2 (803, 804) is illustrated, and as a DMRS pattern structure in which FD-OCC (frequency domain orthogonal cover codes) is applied to frequency-adjacent subcarriers, it can be composed of three CDM groups (CDM group 0, CDM group 1, CDM group 2), and different CDM groups can be FDM.

[0164] In 1 symbol pattern (803), frequency-phase CDM is applied to the same CDM group to distinguish two DMRS ports, thus allowing a total of six orthogonal DMRS ports to be configured. 1 symbol pattern (803) may include DMRS port IDs mapped to each CDM group (DMRS port IDs for the downlink may be indicated as the illustrated number + 1000). In 2 symbol pattern (704), time / frequency-phase CDM is applied to the same CDM group to distinguish four DMRS ports, thus allowing a total of twelve orthogonal DMRS ports to be configured. 2 symbol pattern (804) may include DMRS port IDs mapped to each CDM group (DMRS port IDs for the downlink may be indicated as the illustrated number + 1000).

[0165] As described above, in an NR system, two different DMRS patterns (e.g., DMRS type 1 (801, 802) or DMRS type 2 (803, 804)) can be configured, and each DMRS pattern can be configured to be either a one-symbol pattern (801, 803) or an adjacent two-symbol pattern (802, 804). Additionally, in an NR system, not only are DMRS port numbers scheduled, but the number of CDM groups scheduled together for PDSCH rate matching can also be configured and signaled. Furthermore, in the case of CP-OFDM (cyclic prefix based orthogonal frequency division multiplex), both of the two DMRS patterns described above may be supported in DL and UL, while in the case of DFT-S-OFDM (discrete Fourier transform spread OFDM), only DMRS type 1 (801, 802) among the DMRS patterns described above may be supported in UL.

[0166] Additionally, support may be provided to configure additional DMRS. Front-loaded DMRS refers to the first DMRS transmitted and received at the earliest symbol in the time domain among the DMRS, and additional DMRS refers to the DMRS transmitted and received at a symbol later than the front-loaded DMRS in the time domain. In an NR system, the number of additional DMRS can be configured from a minimum of 0 to a maximum of 3. Additionally, when additional DMRS is configured, the same pattern as the front-loaded DMRS may be assumed. In one embodiment, regarding the front-loaded DMRS, if information is provided regarding whether the aforementioned DMRS pattern type is type 1 or type 2, whether the DMRS pattern is a one-symbol pattern or an adjacent two-symbol pattern, and information regarding the number of DMRS ports and CDM groups used, then when additional DMRS is configured, it may be assumed that the additional DMRS has the same DMRS information as the front-loaded DMRS.

[0167] In one embodiment, the aforementioned downlink DMRS setting can be set through RRC signaling as shown in [Table 6] below.

[0168]

[0169] Here, dmrs-Type can set the DMRS type, dmrs-AdditionalPosition can set additional DMRS OFDM symbols, maxLength can set a 1-symbol DMRS pattern or a 2-symbol DMRS pattern, scramblingID0 and scramblingID1 can set scrambling IDs, and phaseTrackingRS can set the PTRS (phase tracking reference signal).

[0170] In addition, the aforementioned uplink DMRS settings can be configured through RRC signaling as shown in [Table 7] below.

[0171]

[0172] Here, dmrs-Type can set the DMRS type, dmrs-AdditionalPosition (e.g., additional DMRS OFDM symbols) can be set, phaseTrackingRS can set PTRS, and maxLength can set a 1-symbol DMRS pattern or a 2-symbol DMRS pattern. scramblingID0 and scramblingID1 can set scrambling ID0s, nPUSCH-Identity can set the cell ID for DFT-s-OFDM, sequenceGroupHopping can disable sequence group hopping, and sequenceHopping can enable sequence hopping.

[0173] FIG. 9 illustrates an example of channel estimation using DMRS received from one PUSCH in the time band of a wireless communication system according to one embodiment of the present disclosure.

[0174] Referring to Fig. 9, when performing channel estimation for data decoding using DMRS, in the frequency band, channel estimation can be performed within the precoding resource block group (PRG), which is the bundling unit, by using physical resource blocks (PRB) bundling linked to the system band. In addition, in the time unit, the channel can be estimated by assuming that only DMRS received from a single PUSCH has the same precoding.

[0175] The following describes the time domain resource allocation (TDRA) method for data channels in a 5G communication system. A base station can set a time domain resource allocation information table for a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH) for a terminal using upper layer signaling (e.g., RRC signaling).

[0176] The base station may set up a table for PDSCH consisting of a maximum of maxNrofDL-Allocations = 17 entries, and for PUSCH, a table consisting of a maximum of maxNrofUL-Allocations = 17 entries. Time domain resource allocation information may include, for example, PDCCH-to-PDSCH slot timing (corresponding to a slot-unit time interval between the time when PDCCH is received and the time when the PDSCH scheduled by the received PDCCH is transmitted, denoted as K0) or PDCCH-to-PUSCH slot timing (corresponding to a slot-unit time interval between the time when PDCCH is received and the time when the PUSCH scheduled by the received PDCCH is transmitted, denoted as K2), information on the position and length of the starting symbol for which PDSCH or PUSCH is scheduled within the slot, and at least one of the mapping type of PDSCH or PUSCH.

[0177] In one embodiment, time domain resource allocation information for PDSCH can be set to the terminal through RRC signaling as shown in [Table 8] below.

[0178]

[0179] Here, k0 represents the PDCCH-to-PDSCH timing (i.e., the slot offset between DCI and its scheduled PDSCH) in slots, mappingType represents the PDSCH mapping type, startSymbolAndLength represents the starting symbol and length of the PDSCH, and repetitionNumber represents the number of PDSCH transmission occasions according to the slot-based repetition method.

[0180] In one embodiment, time domain resource allocation information for PUSCH can be set to the terminal through RRC signaling as shown in [Table 9] below.

[0181]

[0182] Here, k2 represents the PDCCH-to-PUSCH timing (i.e., the slot offset between DCI and the scheduled PUSCH) in slots, mappingType represents the PUSCH mapping type, startSymbolAndLength or StartSymbol and length represents the starting symbol and length of the PUSCH, and numberOfRepetitions represents the number of repetitions applied to the PUSCH transmission.

[0183] A base station may indicate to a terminal at least one of the entries in a table for time domain resource allocation information via L1 signaling (e.g., downlink control information (DCI)) (e.g., by indicating the 'time domain resource allocation' field within the DCI). Based on the DCI received from the base station, the terminal may obtain time domain resource allocation information for PDSCH or PUSCH.

[0184] The following describes the transmission of the uplink data channel (PUSCH) in a 5G system. PUSCH transmission can be dynamically scheduled by a UL grant within the DCI (e.g., referred to as DG (dynamic grant)-PUSCH) or by a configured grant Type 1 or configured grant Type 2 (e.g., referred to as CG (configured grant)-PUSCH). Dynamic scheduling for PUSCH transmission can be indicated, for example, by DCI format 0_0 or 0_1.

[0185] A PUSCH transmission of a Configured grant Type 1 can be configured semi-statically by receiving a configuredGrantConfig containing the rrc-ConfiguredUplinkGrant of [Table 10] via upper-layer signaling, without receiving a UL grant within the DCI. A PUSCH transmission of a Configured grant Type 2 can be scheduled semi-persistently by a UL grant within the DCI after receiving a configuredGrantConfig that does not contain the rrc-ConfiguredUplinkGrant of [Table 10] via upper-layer signaling.

[0186] In one embodiment, when a PUSCH transmission is scheduled by a configured grant, the parameters applied to the PUSCH transmission may be set through the configuredGrantConfig, an upper-layer signaling of [Table 10], excluding specific parameters provided by the pusch-Config of [Table 11], an upper-layer signaling (e.g., dataScramblingIdentityPUSCH, txConfig, codebookSubset, maxRank, or scaling of UCI-OnPUSCH). For example, if a terminal is provided with a transformPrecoder within the configuredGrantConfig, an upper-layer signaling of [Table 10], the terminal may apply tp-pi2BPSK within the pusch-Config of [Table 11] to the PUSCH transmission operated by the configured grant.

[0187]

[0188] Next, the PUSCH transmission method is described. The DMRS antenna port for PUSCH transmission may be the same as the antenna port for SRS transmission. PUSCH transmission may follow a codebook-based transmission method and a non-codebook-based transmission method, respectively, depending on whether the value of txConfig in pusch-Config in [Table 11], the upper signaling, is 'codebook' or 'nonCodebook'. As described above, PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1 and can be semi-statically configured by a configured grant.

[0189] If the terminal is instructed to schedule a PUSCH transmission via DCI format 0_0, the terminal may perform beam configuration for the PUSCH transmission using a pucch-spatialRelationInfoID corresponding to a terminal-specific (UE-specific, dedicated) PUCCH resource having the lowest ID within an active uplink bandwidth part (BWP) in the serving cell. In one embodiment, the PUSCH transmission may be performed based on a single antenna port. The terminal may not expect to schedule a PUSCH transmission via DCI format 0_0 within a BWP where a PUCCH resource containing pucch-spatialRelationInfo is not configured. If the terminal is not configured with txConfig in pusch-Config of [Table 11], the terminal may not expect to be scheduled via DCI format 0_1.

[0190]

[0191] Next, codebook-based PUSCH transmission is described. Codebook-based PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1 and can operate semi-statically via a configured grant. When Codebook-based PUSCH is dynamically scheduled via DCI format 0_1 ​​or semi-statically configured via a configured grant, the terminal can determine a precoder for PUSCH transmission based on the SRS resource indicator (SRI), TPMI (transmission precoding matrix indicator), and transmission rank (number of PUSCH transmission layers).

[0192] According to one embodiment of the present disclosure, the SRI may be provided through the field SRS resource indicator within the DCI or set through the higher-level signaling srs-ResourceIndicator. The terminal may receive at least one SRS resource during codebook-based PUSCH transmission, and, for example, may receive up to two. When the terminal receives the SRI through the DCI, the SRS resource indicated by the said SRI may refer to the SRS resource corresponding to the SRI among the SRS resources transmitted prior to the PDCCH containing the said SRI. Additionally, the TPMI and transmission rank may be provided through the field precoding information and number of layers within the DCI or set through the higher-level signaling precodingAndNumberOfLayers. The TPMI may be used to indicate the precoder applied to the PUSCH transmission.

[0193] A precoder to be used for PUSCH transmission may be selected from an uplink codebook having the same number of antenna ports as the nrofSRS-Ports value in the upper signaling SRS-Config. In codebook-based PUSCH transmission, the terminal may determine the codebook subset based on TPMI and the codebookSubset in the upper signaling pusch-Config. In one embodiment, the codebookSubset in the upper signaling pusch-Config may be set to one of 'fullyAndPartialAndNonCoherent', 'partialAndNonCoherent', or 'nonCoherent' based on the UE capability reported by the terminal to the base station.

[0194] If the terminal reports 'partialAndNonCoherent' as a UE capability, the terminal may not expect the value of the parent signaling codebookSubset to be set to 'fullyAndPartialAndNonCoherent'. Additionally, if the terminal reports 'nonCoherent' as a UE capability, the terminal may not expect the value of the parent signaling codebookSubset to be set to 'fullyAndPartialAndNonCoherent' or 'partialAndNonCoherent'. If nrofSRS-Ports within the parent signaling SRS-ResourceSet points to two SRS antenna ports, the terminal may not expect the value of the parent signaling codebookSubset to be set to 'partialAndNonCoherent'.

[0195] A terminal can receive one SRS resource set in which the value of usage within the upper signaling SRS-ResourceSet is set to 'codebook', and one SRS resource within that SRS resource set can be indicated via SRI. If multiple SRS resources are configured within the SRS resource set in which the value of usage within the upper signaling SRS-ResourceSet is set to 'codebook', the terminal can expect that the value of nrofSRS-Ports within the upper signaling SRS-Resource will be set to the same value for all SRS resources.

[0196] A terminal transmits one or more SRS resources included in an SRS resource set in which the value of usage is set to 'codebook' according to upper signaling to a base station, and the base station may select one of the SRS resources transmitted by the terminal and instruct the terminal to perform PUSCH transmission using the transmit beam information of the corresponding SRS resource. In one embodiment, in codebook-based PUSCH transmission, an SRI is used as information to select the index of one SRS resource and may be included in a DCI. Additionally, the base station may include information in the DCI that instructs the terminal to use for PUSCH transmission, such as the TPMI and rank, and transmit it. The terminal may perform PUSCH transmission by using the SRS resource instructed by the SRI, applying a precoder instructed by the instructed TPMI and rank based on the transmit beam of the corresponding SRS resource.

[0197] Next, non-codebook-based PUSCH transmission is described. Non-codebook-based PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1, or can operate semi-statically via a configured grant. If at least one SRS resource is configured within an SRS resource set in which the value of usage within the upper signaling SRS-ResourceSet is set to 'nonCodebook', the terminal can receive a non-codebook-based PUSCH transmission scheduled via DCI format 0_1.

[0198] For an SRS resource set in which the value of usage within the upper signaling SRS-ResourceSet is set to 'nonCodebook', the terminal can receive an NZP (non-zero power) CSI-RS resource associated with one SRS resource set. The terminal can perform calculations for a precoder for SRS transmission by measuring the NZP CSI-RS resource associated with the SRS resource set. If the difference between the last received symbol of the aperiodic NZP CSI-RS resource associated with the SRS resource set and the first symbol of the aperiodic SRS transmission at the terminal is less than a specific number of symbols (e.g., 42 symbols), the terminal may not expect the information for the precoder for SRS transmission to be updated.

[0199] If the value of resourceType within the upper signaling SRS-ResourceSet is set to 'aperiodic', the NZP CSI-RS associated with said SRS-ResourceSet may be indicated by the SRS request field within DCI format 0_1 ​​or 1_1. In one embodiment, if the NZP CSI-RS resource associated with the SRS-ResourceSet is an aperiodic NZP CSI resource and the value of the SRS request field within DCI format 0_1 ​​or 1_1 is not '00', it may indicate the existence of the NZP CSI-RS associated with the SRS-ResourceSet. The said DCI may not indicate cross-carrier or cross-BWP scheduling. If the value of the SRS request indicates the existence of the NZP CSI-RS, said NZP CSI-RS may be located in the slot where the PDCCH containing the SRS request field was transmitted. The TCI states set on the scheduled subcarrier may not be set to QCL-TypeD.

[0200] If a periodic or semi-continuous SRS resource set is configured, the NZP CSI-RS associated with said SRS resource set may be indicated through the associated CSI-RS within the parent signaling SRS-ResourceSet. For non-codebook-based transmission, the terminal may not expect the parent signaling spatialRelationInfo for the SRS resource and the associated CSI-RS within the parent signaling SRS-ResourceSet to be configured together.

[0201] When a terminal is configured with multiple SRS resources, it can determine the precoder and transmission rank to be applied to PUSCH transmission based on the SRI indicated by the base station. In one embodiment, the SRI may be indicated via a field SRS resource indicator within the DCI or configured via the srs-ResourceIndicator, which is a higher-level signaling. Similar to the codebook-based PUSCH transmission described above, when the terminal receives the SRI via the DCI, the SRS resource indicated by the SRI may refer to the SRS resource corresponding to the SRI among the SRS resources transmitted prior to the PDCCH containing the SRI. The terminal may use one or multiple SRS resources for SRS transmission, and the maximum number of SRS resources that can be transmitted simultaneously in the same symbol within a single SRS resource set and the maximum number of SRS resources may be determined by the UE capability reported by the terminal to the base station. SRS resources transmitted simultaneously by the terminal may occupy the same RB. The terminal may configure one SRS port for each SRS resource. Only one SRS resource set can be configured with the value of usage in the upper signaling SRS-ResourceSet set set to 'nonCodebook', and up to four SRS resources can be configured for non-codebook-based PUSCH transmission.

[0202] The base station transmits one NZP CSI-RS associated with an SRS resource set to the terminal, and the terminal can calculate a precoder to be used when transmitting one or more SRS resources within the SRS resource set based on the results measured upon receiving the NZP CSI-RS. When the terminal transmits one or more SRS resources within an SRS resource set where usage is set to 'nonCodebook' to the base station, it applies the calculated precoder, and the base station can select one or more SRS resources from among the received one or more SRS resources. In non-codebook-based PUSCH transmission, the SRI may represent an index capable of expressing a combination of one or more SRS resources, and the SRI may be included within the DCI. The number of SRS resources indicated by the SRI transmitted by the base station may be the number of transmission layers of the PUSCH, and the terminal can transmit the PUSCH by applying the precoder applied for SRS resource transmission to each layer.

[0203] The following describes the repetitive transmission of the uplink data channel (PUSCH) and the transmission of a single transport block (TB) through multiple slots in a 5G system. A 5G system can support two types of repetitive transmission methods for the uplink data channel (e.g., PUSCH repetitive transmission type A, PUSCH repetitive transmission type B) and TBoMS (TB processing over multi-slot PUSCH), which transmits multiple PUSCHs across multiple slots for a single TB. Additionally, the terminal can receive a setting for either PUSCH repetitive transmission type A or B through upper-layer signaling. Furthermore, the terminal can transmit TBoMS by receiving 'numberOfSlotsTBoMS' through a resource allocation table.

[0204] [PUSCH Repeated Transmission Type A]

[0205] - As described above, within a single slot, the start symbol and length of the uplink data channel are determined by the time domain resource allocation method, and the base station can transmit the number of repeated transmissions to the terminal via upper layer signaling (e.g., RRC signaling) or L1 signaling (e.g., DCI). To determine the TBS, the number of slots N set by numberOfSlotsTBoMS is 1.

[0206] - Based on the number of repeated transmissions received from the base station, the terminal may repeatedly transmit an uplink data channel in consecutive slots that has the same starting symbol and length as the uplink data channel set above. In one embodiment, in a slot set as downlink by the base station to the terminal, or if at least one of the symbols within the slot for repeated uplink data channel transmission set by the terminal is set as downlink, the terminal may omit the transmission of the uplink data channel in that slot. For example, the terminal may not transmit the uplink data channel within the number of repeated uplink data channel transmissions. On the other hand, a terminal supporting Rel-17 repeated uplink data transmission determines a slot capable of repeated uplink data transmission as an available slot, and can count the number of transmissions when repeating the uplink data channel in a slot determined to be an available slot. If repeated uplink data channel transmission determined to be an available slot is omitted, it may be repeated through a slot capable of transmission after postponement. Using the following [Table 12], a redundancy version can be applied according to the redundancy version pattern set for each nth PUSCH transmission occasion.

[0207] [PUSCH Repeated Transmission Type B]

[0208] - As described above, within a single slot, the start symbol and length of the uplink data channel are determined by the time domain resource allocation method, and the base station can transmit the number of repetitions to the terminal via upper signaling (e.g., RRC signaling) or L1 signaling (e.g., DCI). In one embodiment, the number of slots N set as numberOfSlotsTBoMS to determine the TBS is 1.

[0209] - First, based on the starting symbol and length of the uplink data channel set above, the nominal repetition of the uplink data channel can be determined as follows. Here, nominal repetition may refer to the symbol resources set by the base station for repeated PUSCH transmission, and the terminal can determine the resources available for uplink use from the set nominal repetition. In this case, the slot where the nth nominal repetition starts is The symbol given by and where nominal repetition starts in the above start slot is It can be given by. The slot where the nth nominal repetition ends is The symbol given by and where the nominal repetition ends in the last slot above is It can be given by, where n=0,...,numberofrepetitions-1, S represents the starting symbol of the configured uplink data channel, and L represents the symbol length of the configured uplink data channel. indicates the slot where the PUSCH transmission starts. can represent the number of symbols per slot.

[0210] - The terminal can determine an invalid symbol for PUSCH repeat transmission type B. A symbol configured for the downlink by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated can be determined as an invalid symbol for PUSCH repeat transmission type B. Additionally, an invalid symbol can be set based on an upper layer parameter (e.g., InvalidSymbolPattern). As an example, the upper layer parameter (e.g., InvalidSymbolPattern) can set an invalid symbol by providing a symbol-level bitmap spanning one or two slots. In one embodiment, a value marked as 1 in the bitmap may represent an invalid symbol. Additionally, the period and pattern of the bitmap can be set through an upper layer parameter (e.g., periododicityAndPattern). If an upper layer parameter (e.g., InvalidSymbolPattern) is set and the InvalidSymbolPatternIndicator-ForDCIFormat0_1 or InvalidSymbolPatternIndicator-ForDCIFormat0_2 parameter indicates 1, the terminal may apply the invalid symbol pattern, and if it indicates 0, it may not apply the invalid symbol pattern. Alternatively, if an upper layer parameter (e.g., InvalidSymbolPattern) is set and the InvalidSymbolPatternIndicator-ForDCIFormat0_1 or InvalidSymbolPatternIndicator-ForDCIFormat0_2 parameter is not set, the terminal may apply the invalid symbol pattern.

[0211] - After an invalid symbol is determined in each nominal repetition, the terminal may consider the symbols excluding the determined invalid symbol as valid symbols. If one or more valid symbols are included in each nominal repetition, the nominal repetition may include one or more actual repetitions. Here, each actual repetition may refer to a symbol actually used for PUSCH repeat transmission among the symbols set in the above-mentioned nominal repetition, and may include a continuous set of valid symbols that can be used for PUSCH repeat transmission type B within a single slot. Except when the symbol length L of the configured uplink data channel is 1, the terminal may omit the transmission of the actual repetition if an actual repetition having one symbol is set as valid. Using [Table 12] below, a redundancy version may be applied according to the redundancy version pattern configured for each n-th actual repetition.

[0212] [TB processing over multiple slots (TBoMS)]

[0213] - As described above, the start symbol and length of the uplink data channel are determined by a time domain resource allocation method within a single slot, and the base station can transmit the number of repeated transmissions to the terminal via upper layer signaling (e.g., RRC signaling) or L1 signaling (e.g., DCI). In one embodiment, TBS can be determined using a value of N greater than or equal to 1, which is the number of slots set by numberOfSlotsTBoMS.

[0214] - Based on the number of slots and the number of repeated transmissions for determining the TBS received from the base station, the terminal may transmit an uplink data channel in consecutive slots that has the same starting symbol and length as the uplink data channel set above. In one embodiment, in a slot set as a downlink by the base station to the terminal, or if at least one of the symbols within the slot for repeated transmission of the uplink data channel set by the terminal is set as a downlink, the terminal may omit the transmission of the uplink data channel in that slot. For example, it may be included in the number of repeated transmissions of the uplink data channel but may not be transmitted.

[0215] On the other hand, a terminal supporting Rel-17 uplink data repeat transmission determines that a slot capable of uplink data repeat transmission is an available slot, and the number of transmissions for the slot determined to be an available slot can be counted during uplink data channel repeat transmission. If the uplink data channel repeat transmission determined to be an available slot is omitted, it can be repeated through a slot that is available for transmission after postponement. In one embodiment, using [Table 12] below, a redundancy version may be applied according to the redundancy version pattern set for each nth PUSCH transmission occasion.

[0216]

[0217] The following describes a method for determining an uplink available slot for a single or multiple PUSCH transmission in a 5G system.

[0218] According to one embodiment of the present disclosure, when a terminal is configured to enable AvailableSlotCounting, the terminal can determine an available slot for Type A PUSCH repeated transmission and TBoMS PUSCH transmission based on tdd-UL-DL-ConfigurationCommon, tdd-UL-DL-ConfigurationDedicated, ssb-PositionsInBurst, and the TDRA (time domain resource allocation) information field value. That is, if at least one symbol configured as TDRA for PUSCH in a slot for PUSCH transmission overlaps with at least one symbol for a purpose other than uplink transmission, the slot may be determined as an unavailable slot.

[0219] The following describes a method to reduce SSB density through dynamic signaling for base station energy saving in 5G systems.

[0220] FIG. 10 illustrates a method for resetting SSB transmission through dynamic signaling of a wireless communication system according to one embodiment of the present disclosure.

[0221] Referring to FIG. 10, the terminal can receive ssb-PositionsInBurst = '11110000' (1002) from the base station via upper layer signaling (SIB1 or ServingCellConfigCommon). At a subcarrier interval of 30 kHz, up to two synchronization signal blocks can be transmitted within a time of 0.5 ms (or the length of one slot if one slot consists of 14 OFDM symbols), and accordingly, the terminal can receive four synchronization signal blocks (SSB) within a time of 1 ms (or the length of two slots if one slot consists of 14 OFDM symbols). At this time, the base station can reset the SSB transmission setting information by broadcasting the bitmap '1010xxxx' (1004) through the Group / Cell common DCI (1003) having the nwes-RNTI (network energy saving-Radio Network Temporary Identifier) ​​(or es-RNTI) to reduce the density of SSB transmission for energy saving. At this time, the transmission of SS block #1 (1005) and SS block #3 (1006) can be canceled based on the bitmap (1004) set by the Group / Cell common DCI. FIG. 10 illustrates a method (1001) for resetting SSB transmission through the bitmap-based group / Cell common DCI.

[0222] Additionally, the base station can reset the SSB-periodicity set via upper-layer signaling through the Group / Cell common DCI. Furthermore, by additionally setting Timer information to indicate the application time of the Group / Cell common DCI, the base station can transmit SSBs using the SSB transmission information reset via the Group / Cell common DCI during the set timer. After the timer ends, the base station can operate using the SSB transmission information set via the existing upper-layer signaling. This allows the setting to be switched from normal mode to energy-saving mode via the timer, thereby resetting the SSB configuration information. Alternatively, the base station can set the application time and duration of the SSB configuration information reset via the Group / Cell common DCI to the terminal using Offset and Duration information. In this case, the terminal may not monitor SSBs for the Duration period, starting from the moment the Group / Cell common DCI is received and the moment the Offset is applied.

[0223] The following describes BWP or BW adaptation methods through dynamic signaling for base station energy saving in 5G systems.

[0224] FIG. 11 illustrates a method for resetting BWP and BW through dynamic signaling of a wireless communication system according to one embodiment of the present disclosure.

[0225] Referring to FIG. 11, the terminal can operate as an activated BWP or BW through upper layer signaling and L1 signaling from the base station (1101). For example, a fixed power PSD B It can operate via a full 100MHz bandwidth. In this case, the base station uses an equal power PSD for energy saving. BWith this, the BW and BWP can be adjusted to enable a narrower BW of 40 MHz for the terminal (1102). At this time, the adjustment operation of the BW or BWP for energy saving of the base station can be set to match the BWP and BW settings specifically set for the UE through the Group common DCI and Cell specific DCI (1103). For example, UE#0 and UE#1 may have different BWP configurations and locations. At this time, the BW and BWP of all terminals can be set to one identically to save energy by reducing the BW used by the base station. At this time, the BWP or BW in the operation for energy saving can be set to one or more, and this can be used to set the BWP per UE Group.

[0226] In describing the present disclosure, the term "upper layer signaling" may refer to a signaling corresponding to at least one or a combination of at least one of the following signalings.

[0227] - MIB (Master Information Block)

[0228] - SIB (System Information Block) or SIB

[0229] - RRC (Radio Resource Control)

[0230] - MAC (Medium Access Control) CE (Control Element)

[0231] In addition, L1 signaling may be a signaling corresponding to at least one or a combination of at least one of the following physical layer channels or signaling methods using signaling.

[0232] - PDCCH (Physical Downlink Control Channel)

[0233] - DCI (Downlink Control Information)

[0234] - Terminal-specific (UE-specific) DCI

[0235] - Group common DCI

[0236] - Common DCI

[0237] - Scheduling DCI (e.g., DCI used for the purpose of scheduling downlink or uplink data)

[0238] - Non-scheduling DCI (e.g., DCI not intended for scheduling downlink or uplink data)

[0239] - PUCCH (Physical Uplink Control Channel)

[0240] - UCI (Uplink Control Information)

[0241] In the following disclosure, the examples are described through a plurality of embodiments, but these are not independent, and one or more embodiments may be applied simultaneously or in combination.

[0242] The following describes a DRX alignment method using dynamic signaling for base station energy saving in 5G systems.

[0243] FIG. 12 illustrates a method for resetting DRX through dynamic signaling of a wireless communication system according to one embodiment of the present disclosure.

[0244] Referring to FIG. 12, the base station can set the DRX specifically for the UE through upper layer signaling. For example, different drx-LongCycle (1202) or drx-ShortCycle, drx-onDurationTimer (1203) and drx-InactivityTimer (1204) can be set for each terminal. Subsequently, for energy saving, the base station can set the UE-specific DRX settings specifically for the UE group or cell through L1 signaling (1201). Through this, the base station can obtain the same effect for energy saving as the terminal saves power through the DRX.

[0245] The following illustrates an example describing Discontinuous transmission (DTx, DTX) operations to reduce energy consumption of base stations in a 5G system.

[0246] FIG. 13 is a diagram illustrating a DTx method for base station energy saving according to one embodiment of the present disclosure.

[0247] Referring to FIG. 13, the base station can set DTx for energy saving through upper layer signaling (e.g., new system information block (SIB) for DTx or RRC signaling) and L1 signaling (e.g., DCI). At this time, the base station may set a dtx-onDurationTimer (1305) for transmitting a reference signal for measuring RRM measurement, beam management, path loss, etc., for scheduling a DL SCH (shared channel) for DTx operation, a dtx-InactivityTimer (1306) for receiving a PDSCH after receiving a PDCCH for scheduling a DL SCH, a synchronization signal (SS) (1303) for synchronization before the dtx-onDurationTimer, a dtx-offset (1304) for setting an offset between the dtx-onDurationTimer and the dtx-onDurationTimer after the setting information, and a dtx-(Long)Cycle (1302) for DTx to operate periodically based on the setting information. At this time, the dtx-cycle (1302) may be set to multiple long cycles and short cycles. During DTx operation, the base station considers the transmitter to be off (or inactive) and therefore may not transmit DL CCH, SCH, and DL RS. That is, during DTx operation, the base station may transmit downlink (e.g., PDCCH, PDSCH, RS, etc.) only during SS, dtx-onDurationTimer, and dtx-InactivityTimer. At this time, as additional information for the configured SS, SS-gapbetweenBurst (the gap between SS bursts in the time domain) or the number of SS bursts may be additionally configured.

[0248] The following describes a method for activating a base station via a gNB wake-up signal (WUS) during the base station's inactive mode to reduce energy consumption in a 5G system.

[0249] FIG. 14 illustrates an example explaining the operation of a base station according to a gNB WUS according to one embodiment of the present disclosure.

[0250] Referring to FIG. 14, the base station may keep the transmitter in an Off (or inactive) state during the base station's inactive state (or sleep mode) for energy saving. Subsequently, the base station may receive a gNB WUS (1402) from the terminal to activate the base station's sleep mode. Subsequently, when the base station receives a WUS from the terminal via the Rx terminal, it may change the Tx terminal to an On (or active) state (1403). Subsequently, the base station may perform downlink transmission to the terminal. At this time, the base station may perform synchronization after Tx is turned on and perform Control and Data transmission. In addition, various uplink signals, such as PRACH (physical random access channel), scheduling request (SR) PUCCH, PUCCH including Ack, etc., may be considered as gNB WUS. Through the above method, the base station can save energy, and at the same time, the terminal can improve latency.

[0251] At this time, the base station may set a WUS occasion for receiving the gNB WUS and a Sync RS for synchronization before the terminal transmits the gNB WUS. At this time, as the Sync RS, an SSB, TRS (tracking reference signal), Light SSB (PSS+SSS), consecutive SSBs, or new RS (continuous PSS + SSS) may be considered, and as the WUS, a PRACH, PUCCH with SR, or sequence-based signal may be considered. The Sync RS (1404) for the terminal to activate the base station's energy-saving disable mode and the WUS occasion for receiving the WUS may be transmitted repeatedly with WUS-RS periodicity (1405). In the case of FIG. 14, one embodiment is described with an example of a 1-to-1 mapping between the Sync RS and the WUS occasion, but the present disclosure is not limited thereto. For example, the Sync and WUS occasion may be N-to-1 mapped, 1-to-N mapped, or N-to-M mapped.

[0252] The following describes a method for dynamically turning on / off the Spatial domain elements (i.e., Antenna, power amplifier (PA), or TxRUs (transceiver units or transmission radio units)) of a base station to save base station energy in a 5G system.

[0253] FIG. 15 is a diagram illustrating an antenna adaptation method for a base station for energy saving of a wireless communication system according to one embodiment of the present disclosure.

[0254] Referring to FIG. 15, the base station can adjust the number of Tx antenna ports per RU (radio unit) for network energy savings (NWES) (1501). For example, since the power amplifier (PA) of the base station accounts for most of the base station's energy consumption, the base station can turn off the Tx antenna to save energy. At this time, the base station may refer to / use the terminal's RSRP (reference signal received power), CQI (channel quality indicator), and RSRQ (reference signal received quality) to determine whether the Tx antenna can be turned off. The base station can transmit Tx by adjusting the number of activated Tx antennas per UE group or per UE. At this time, the base station may set information including one or more of beam information or Reference Signal information (e.g., one or more of CSI resource, CSI resource set, or CSI report) according to the antenna on / off to the terminal through upper layer signaling (e.g., RRC signaling) or DCI signaling. In addition, the base station can set different antenna information for each BWP and reset the antenna information in response to changes in the BWP. Furthermore, the base station can receive CSI feedback from the terminal to determine the feasibility of spatial domain (SD) adaptation. The base station can determine SD adaptation (based on the CSI feedback). The base station can receive multiple feedback from the terminal through antenna structure hypotheses of various antenna patterns for SD adaptation.

[0255] More specifically, the base station may apply multiple types of SD adaptation (e.g., two types) for energy saving (1502). For example, the multiple types may include Type 1 SD adaptation (1503) and Type 2 SD adaptation (1504).

[0256] When Type 1 SD adaptation (1503) is applied, the base station can adapt the number of antenna ports while maintaining the number of physical antenna elements per antenna port (i.e., logical port). At this time, the RF characteristics (e.g., tx power, beam) per port can be the same. Therefore, the terminal can combine the CSI-RS of the same port during CSI measurements (e.g., L1-RSRP (layer 1-RSRP), L3-RSRP (layer 3-RSRP), etc.).

[0257] In another way, when Type 2 SD adaptation (1504) is applied, the base station can turn on / off physical antenna elements per port with the same number of antenna ports (i.e., logical ports) (1504). In this case, the RF characteristics per port may differ. During CSI measurement, the terminal can distinguish the CSI-RS of the same port and perform measurements for each. The base station can save energy through one or more of a plurality of types of SD adaptation methods, including the two types of SD adaptation methods mentioned above.

[0258] The following describes a method for transmitting an on-demand SSB for energy saving in a base station in a 5G system and for receiving settings and instructions for receiving an on-demand SSB by a terminal. Unless otherwise specifically noted, the on-demand SSB described below may be received by a terminal capable of receiving on-demand SSB settings and instructions and receiving an on-demand SSB, and the on-demand SSB may be transmitted by a base station capable of transmitting settings and instructions for an on-demand SSB and transmitting an on-demand SSB.

[0259] FIG. 16 is a diagram illustrating an example of on-demand SSB operation in a situation where SCell is set to a terminal but before activation, according to one embodiment of the present disclosure.

[0260] FIG. 16 illustrates the transmission of an on-demand SSB in a situation where, after a terminal has connected to a primary cell (Pcell), the terminal possessing carrier aggregation (CA) capability receives a setting for an S-cell (or information related to the setting) from a base station and before receiving an activation instruction for the S-cell from the base station. Information regarding the transmission of the on-demand SSB (e.g., a set of information for a single on-demand SSB transmission), such as the transmission frequency position, transmission position in the time domain, transmission period, number of transmissions, transmission interval, and transmission power, can be set for the terminal by a higher layer signaling (e.g., an RRC message). For example, when the S-cell is set by the higher layer signal, the information regarding the transmission of the on-demand SSB may be set together, or it may be set by a separate higher layer signal, separated from the S-cell setting.

[0261] According to one embodiment, the upper signal may include a set of information for one on-demand SSB transmission or a set of information for multiple on-demand SSB transmissions. The upper signal for setting the on-demand SSB itself may indicate on-demand SSB transmission, and a signal indicating on-demand SSB transmission may be transmitted from the base station to the terminal separately from the upper signal for setting the on-demand SSB. (Hereinafter, the signal indicating transmission may correspond to information indicating that the base station transmits the on-demand SSB to the terminal, and may correspond to a signal indicating that transmission has started or information indicating or activating the reception of the on-demand SSB.) The indication signal may be another upper signal, a MAC signal, or a physical signal. In the above, when a set of information for multiple on-demand SSB transmissions is set as a higher signal, the signal indicating an on-demand SSB transmission may indicate a specific on-demand SSB transmission by indicating one of the one or more sets or information.

[0262] According to one embodiment, the always-on SSB may correspond to an SSB defined to always be transmitted in the cell (e.g., cell defining SSB, CD-SSB), and may be configured to be transmitted at a specific frequency position (e.g., a frequency position corresponding to an on-sync raster), a specific period, or a specific time. Alternatively, depending on the configuration, the always-on SSB may not correspond to an SSB defined to be transmitted in the cell.

[0263] According to one embodiment, the on-demand SSB may correspond to an SSB that is not defined to always be transmitted in the cell (e.g., CD-SSB) (e.g., NCD (non-cell defining)-SSB or NCD-SSB transmitted in an off-sync raster, etc.). Alternatively, depending on the configuration, the on-demand SSB may correspond to an SSB defined to be transmitted in the cell (e.g., CD-SSB or CD-SSB transmitted in an on-sync raster).

[0264] In FIGS. 16 and 17, the downward arrow may indicate a downlink transmitted from the base station to the terminal, and the upward arrow may indicate an uplink transmitted from the terminal to the base station.

[0265] According to FIG. 16, Case #1 (1610) illustrates a situation where an always-on SSB, which is always transmitted periodically, is not transmitted from the S cell or from another reference cell for the S cell (for the purpose of saving energy at the base station, etc.). In Case #1 (1610), fast S cell activation may not be possible because there is no always-on SSB, which is always transmitted periodically for the S cell (which may refer to the synchronization signal blocks described in FIGs. 4 through 7, and which indicate the SIB1 reception resource in the PBCH within the synchronization signal block). In this case, an on-demand SSB (1601) may be used to quickly activate the S cell. In Case #1 (1610), the terminal receives an on-demand SSB setting and / or instruction from the base station and receives the on-demand SSB (1601) to perform a measurement on the S cell. By reporting the channel status to the base station through the above-mentioned on-demand SSB measurement, the terminal or the base station can determine that the S-cell is in a known state rather than an unknown state. If an activation instruction for the S-cell is received from the base station, rapid S-cell activation may be possible by receiving the temporary RS or CSI-RS QCLed to the on-demand SSB and reporting the corresponding CSI to the base station.

[0266] According to FIG. 16, Case #2 (1620) illustrates a situation in which an always-on SSB (1602) that is periodically transmitted is transmitted from an S cell or from another reference cell for the S cell. In Case #2 (1620), although there is an always-on SSB that is always transmitted for the S cell, it is transmitted at a period too long (e.g., longer than the period for S cell measurement according to one embodiment) (for energy saving of the base station, etc.), so the terminal may not be able to perform rapid S cell activation because it is difficult for the terminal to measure the S cell from the always-on SSB. In this case, an on-demand SSB (1601) according to one embodiment of the present disclosure may be used to rapidly activate the S cell. In Case #2 (1620), the terminal may receive an on-demand SSB setting and / or instruction from the base station and receive the on-demand SSB (1601) to perform measurement for the S cell. By reporting the channel status to the base station through the above-mentioned on-demand SSB measurement, the terminal or the base station can determine that the S-cell is in a known state rather than an unknown state. If an activation instruction for the S-cell is received from the base station, rapid S-cell activation may be possible by receiving the temporary RS or CSI-RS QCLed to the on-demand SSB and reporting the corresponding CSI to the base station.

[0267] FIG. 17 is a diagram illustrating an example of on-demand SSB operation in a situation where an activation instruction for an S cell is received according to an embodiment of the present disclosure.

[0268] FIG. 17 illustrates a situation where, after a terminal has connected to a P-cell, a terminal with carrier aggregation capability receives a configuration for an S-cell from a base station, and then receives an activation instruction for an S-cell from a base station, an instruction to transmit an on-demand SSB is given at the same moment (or time position, same OFDM symbol, or same slot). Information regarding on-demand SSB transmission, such as the transmission frequency position of the on-demand SSB, the transmission position in the time domain, the transmission period, the number of transmissions, the transmission interval, the transmission power, etc. (e.g., a set of information for a single on-demand SSB transmission), can be configured for the terminal by a higher-level signal. For example, when the S-cell is configured by a higher-level signal, the information regarding the on-demand SSB transmission may be configured together, or it may be configured by a separate higher-level signal, separated from the S-cell configuration.

[0269] According to one embodiment, the upper signal may include a set of information for one on-demand SSB transmission or a set of information for multiple on-demand SSB transmissions. The upper signal for setting the on-demand SSB itself may indicate on-demand SSB transmission, and a signal indicating on-demand SSB transmission may be transmitted from the base station to the terminal separately from the upper signal for setting the on-demand SSB. The indication signal may be another upper signal, a MAC signal, or a physical signal. Alternatively, information indicating on-demand SSB transmission may be included in a signal indicating the activation of an S-cell, and the signal indicating on-demand SSB transmission may be a signal separate from the signal indicating the activation of an S-cell. In the above case, when a set of information for multiple on-demand SSB transmissions is set as the upper signal, the signal indicating on-demand SSB transmission may indicate a specific on-demand SSB transmission by indicating one of the one or more sets or information.

[0270] According to FIG. 17, Case #1 (1710) illustrates a situation where an always-on SSB, which is always transmitted periodically, is not transmitted from the S cell or from another reference cell for the S cell (for the purpose of saving energy in the base station, etc.). In Case #1 (1710), because there is no always-on SSB that is always transmitted periodically for the S cell (which may refer to the synchronization signal blocks described in FIG. 4 through 7, and which indicate the SIB1 reception resource in the PBCH within the synchronization signal block), rapid S cell activation may not be possible even if an activation instruction for the S cell is received. In this case, an on-demand SSB (1701) may be used to rapidly activate the S cell. In Case #1 (1710), the terminal can simultaneously receive an activation instruction (1703) for the S cell and an on-demand SSB instruction (1704) from the base station and receive the on-demand SSB (1701) to perform a measurement for the S cell. Rapid S-cell activation may be possible by reporting the channel status to the base station through the above-mentioned on-demand SSB measurement, or by receiving a temporary RS or CSI-RS QCLed to the above-mentioned on-demand SSB and reporting the corresponding CSI to the base station.

[0271] Next, Case #2 (1720) illustrates a situation in which an always-on SSB, which is transmitted periodically, is transmitted from an S cell or from another reference cell for the S cell. In Case #2 (1720), although there is an always-on SSB that is always transmitted for the S cell, it is transmitted at a period too long (e.g., longer than the period for S cell measurement according to one embodiment) (for the sake of energy saving of the base station, etc.), so the terminal may not be able to perform rapid S cell activation even if it receives an activation instruction for the S cell because it is difficult for the terminal to measure the S cell from the always-on SSB. At this time, an on-demand SSB (1701) according to one embodiment of the present disclosure may be used to rapidly activate the S cell. In Case #2 (1720), the terminal can simultaneously receive an activation instruction (1703) for the S cell and an on-demand SSB instruction (1704) from the base station and receive the on-demand SSB (1701) to perform measurement for the S cell. Rapid S-cell activation may be possible by reporting the channel status to the base station through the above-mentioned on-demand SSB measurement, or by receiving a temporary RS or CSI-RS QCLed to the above-mentioned on-demand SSB and reporting the corresponding CSI to the base station.

[0272] Next, we propose a method for a terminal to receive instructions for on-demand SSB transmission, measure the on-demand SSB, and report CSI for the S-cell. In particular, we propose a method for securing a CPU (CSI Processing Unit) when measuring the above-mentioned on-demand SSB and reporting CSI, which includes L1 measurements such as L1-RSRP or L1-SINR, to a PUCCH or PUSCH via periodic CSI, semi-persistent CSI, or aperiodic CSI.

[0273] [CSI computation time]

[0274] When a base station instructs a terminal to provide an aperiodic CSI report or a semi-persistent CSI report via DCI, the terminal can determine whether it can perform a valid channel report through the instructed CSI report by considering the channel computation time required for the CSI report. For the aperiodic CSI report or semi-persistent CSI report instructed via DCI, the terminal can perform a valid CSI report starting from the uplink symbol after the Z symbol, after the last symbol included in the PDCCH containing the DCI instructing the CSI report has ended. The aforementioned Z symbol may vary depending on the numerology of the downlink bandwidth part corresponding to the PDCCH containing the DCI instructing the CSI report, the numerology of the uplink bandwidth part corresponding to the PUSCH transmitting the CSI report, and the type or characteristics of the channel information reported in the CSI report (report quantity, frequency band granularity, number of reference signal ports, codebook type, etc.). In other words, for a CSI report to be determined as a valid CSI report (for the CSI report to be valid), the uplink transmission of the CSI report, including the timing advance, must not be performed before the Zref symbol. In this case, the Zref symbol is time from the moment the last symbol of the aforementioned triggering PDCCH ends. It is an uplink symbol that initiates the CP (cyclic prefix). Here, the detailed value of Z follows the explanation below, , , , , and μ is numerology. In this case, μ is The largest of them It can be promised to use something that causes a value, is the subcarrier interval used for PDCCH transmission, is the subcarrier spacing used for CSI-RS transmission, can refer to the subcarrier spacing of the uplink channel used for transmitting UCI (Uplink control information) for CSI reporting. As another example, μ is The largest of them It is also possible to promise to use something that causes a value. and Refer to the explanation above for the definition. For convenience of future explanation, satisfying the above conditions will be referred to as satisfying CSI reporting validity condition 1.

[0275] Furthermore, if the reference signal for channel measurement regarding the aperiodic CSI report instructed to the terminal via the DCI is an aperiodic reference signal, a valid CSI report can be executed starting from the uplink symbol following the Z' symbol after the end of the last symbol containing the reference signal. The aforementioned Z' symbol may vary depending on the numerology of the downlink bandwidth part corresponding to the PDCCH containing the DCI instructing the CSI report, the numerology of the bandwidth corresponding to the reference signal for channel measurement regarding the CSI report, the numerology of the uplink bandwidth part corresponding to the PUSCH transmitting the CSI report, and the type or characteristics of the channel information reported in the CSI report (report quantity, frequency band granularity, number of ports of the reference signal, codebook type, etc.). In other words, for a CSI report to be determined as a valid CSI report (for the CSI report to be a valid CSI report), the uplink transmission of the CSI report, including the timing advance, must not be executed before the Zref' symbol. At this time, the Zref' symbol is time from the moment the last symbol of the non-periodic CSI-RS or non-periodic CSI-IM triggered by the aforementioned triggering PDCCH ends. It is an uplink symbol that initiates the CP (cyclic prefix). Here, the detailed value of Z' follows the explanation below, , , , , and μ is numerology. In this case, μ is The largest of them It can be promised to use something that causes a value, is the subcarrier interval used for triggering PDCCH transmission, is the subcarrier spacing used for CSI-RS transmission, can refer to the subcarrier spacing of the uplink channel used for transmitting UCI (Uplink control information) for CSI reporting. As another example, μ is The largest of them It can be promised to use what causes a value. In this case, and Refer to the explanation above for the definition. For convenience of future explanation, satisfying the above conditions will be referred to as satisfying CSI reporting validity condition 2.

[0276] If a base station instructs a terminal to perform an aperiodic CSI report on an aperiodic reference signal via DCI, the terminal may perform a valid CSI report starting from the first uplink symbol that satisfies both the time point Z after the end of the last symbol included in the PDCCH containing the DCI instructing the CSI report and the time point Z' after the end of the last symbol containing the reference signal. That is, in the case of aperiodic CSI reporting based on an aperiodic reference signal, it is determined to be a valid CSI report only if it satisfies both CSI reporting validity conditions 1 and 2.

[0277] If the timing of the CSI report instructed by the base station does not satisfy the CSI computation time requirements, the terminal may determine that the CSI report is invalid and not consider updating the channel information status for the CSI report.

[0278] The Z and Z' symbols for the aforementioned CSI computation time calculation follow [Table 13] and [Table 14] below. For example, if the channel information reported in the CSI report includes only wideband information, the number of reference signal ports is 4 or less, there is one reference signal resource, the codebook type is 'type I-SinglePanel', or the type of reported channel information (report quantity) is 'cri-RI-CQI', the Z and Z' symbols are those in [Table 14]. It follows the value. This will be named Delay Requirement 2 in the future. In addition, if the PUSCH containing the CSI report does not contain a TB or HARQ-ACK and the terminal's CPU occupation is 0, the Z and Z' symbols are from [Table 13]. It follows the value and is named Delay Requirement 1. The explanation regarding the aforementioned CPU occupation is described in detail below. Additionally, if the report quantity is 'cri-RSRP' or 'ssb-Index-RSRP', the Z and Z' symbols are from [Table 14]. Follows the values. X1, X2, X3, and X4 in [Table 14] represent the terminal's capability (UE capability) regarding beam reporting time, and KB1 and KB2 in [Table 14] represent the terminal's capability regarding beam switching time. In cases where the type or characteristic of channel information reported in the aforementioned CSI report does not apply, the Z and Z' symbols are [Table 14] Follows the value.

[0279]

[0280]

[0281] [CSI reference resource]

[0282] When a base station instructs a terminal to issue an aperiodic / semi-persistent / periodic CSI report, it may set a CSI reference resource to determine the reference time and frequency for the channel to be reported in the CSI report. The frequency of the CSI reference resource may be the carrier and subband information to be measured for the CSI, as specified in the CSI report configuration, and may correspond to the carrier and reportFreqConfiguration, respectively, within the upper-layer signaling CSI-ReportConfig. The time of the CSI reference resource may be defined based on the time at which the CSI report is transmitted. For example, if CSI report #X is instructed to be transmitted in the uplink slot n' of the carrier and BWP to which the CSI report is to be transmitted, the time of the CSI reference resource for CSI report #X may be defined as the downlink slot n-nCSI-ref of the carrier and BWP measuring the CSI. When downlink slot n is named μ_DL for the numerology of the carrier and BWP measuring CSI and μ_UL for the numerology of the carrier and BWP transmitting CSI report #X It is calculated as follows. nCSI-ref, the slot interval between downlink slot n and the CSI reference signal, depends on the number of CSI-RS / SSB resources for channel measurement when CSI report #X transmitted in uplink slot n' is a semi-persistent or periodic CSI report, if a single CSI-RS / SSB resource is connected to the said CSI report If it follows and multiple CSI-RS / SSB resources are connected to the relevant CSI report Follows. If the CSI report #X transmitted in uplink slot n' is an aperiodic CSI report, considering the CSI computation time Z' for channel measurement It is calculated as. The aforementioned is the number of symbols included in a slot, and in NR It assumes.

[0283] When a base station instructs a terminal to transmit a CSI report in uplink slot n' via upper layer signaling or DCI, the terminal may report a CSI by performing channel measurement or interference measurement on a CSI-RS resource, CSI-IM resource, or SSB resource associated with the CSI report that is transmitted no later than the CSI reference resource slot of the CSI report transmitted in uplink slot n'. The CSI-RS resource, CSI-IM resource, or SSB resource connected to the above CSI report may refer to a CSI-RS resource, CSI-IM resource, or SSB resource included in a resource set configured in a resource setting referenced by a report setting for a CSI report of a terminal configured through upper layer signaling, or a CSI-RS resource, CSI-IM resource, or SSB resource referenced by a CSI report trigger state containing parameters for the CSI report, or a CSI-RS resource, CSI-IM resource, or SSB resource pointed to by an ID of a reference signal (RS) set.

[0284] In embodiments of the present disclosure, a CSI-RS / CSI-IM / SSB occasion refers to the transmission time of a CSI-RS / CSI-IM / SSB resource(s) determined by an upper layer setting or a combination of an upper layer setting and DCI triggering. For example, for a semi-persistent or periodic CSI-RS resource, the slot to be transmitted is determined by the slot period and slot offset set by the upper layer signaling, and the transmitted symbol(s) within the slot are determined by the resource mapping information. For another example, for an aperiodic CSI-RS resource, the slot to be transmitted is determined by the slot offset with the PDCCH containing the DCI indicating channel reporting set by the upper layer signaling, and the transmitted symbol(s) within the slot are determined by the resource mapping information.

[0285] The aforementioned CSI-RS occasion can be determined by independently considering the transmission time of each CSI-RS resource or by comprehensively considering the transmission time of one or more CSI-RS resource(s) included in the resource set; accordingly, the following two interpretations are possible for the CSI-RS occasion according to each resource set setting.

[0286] - Interpretation 1-1: From the start time of the earliest symbol to the end time of the latest symbol during which a specific resource among one or more CSI-RS resources included in the resource set(s) configured in the resource setting referenced by the report setting configured for the CSI report is transmitted.

[0287] - Interpretation 1-2: Among all CSI-RS resources included in the resource set(s) configured in the resource setting referenced by the report setting configured for the CSI report, from the start time of the earliest symbol transmitted by the earliest transmitted CSI-RS resource to the end time of the latest symbol transmitted by the latest transmitted CSI-RS resource

[0288] In the embodiments of the present disclosure below, it is possible to individually apply both interpretations of the CSI-RS occasion. Additionally, while it is possible to consider both interpretations for the CSI-IM occasion and the SSB occasion, just as with the CSI-RS occasion, the principle is similar to the explanation above, so redundant explanations will be omitted below.

[0289] In embodiments of the present disclosure, 'CSI-RS / CSI-IM / SSB occasion for CSI report #X transmitted in uplink slot n'' refers to a set of CSI-RS occasions, CSI-IM occasions, and SSB occasions among the CSI-RS resource, CSI-IM resource, and SSB resource CSI-RS occasions, CSI-IM occasions, and SSB occasions included in the resource set of the resource setting referenced by the report setting set for CSI report #X, which are not later than the CSI reference resource of CSI report #X transmitted in uplink slot n'.

[0290] In the embodiments of the present disclosure, the latest CSI-RS / CSI-IM / SSB occasion among the CSI-RS / CSI-IM / SSB occasions for CSI report #X transmitted in 'uplink slot n' can be interpreted in the following two ways.

[0291] - Interpretation 2-1: A set of occasions including the latest CSI-RS occasion for CSI report #X transmitted in uplink slot n', the latest CSI-IM occasion for CSI report #X transmitted in uplink slot n', and the latest SSB occasion for CSI report #0 transmitted in uplink slot n'.

[0292] - Interpretation 2-2: The latest occasion among the CSI-RS occasion, CSI-IM occasion, and SSB occasion for CSI report #X transmitted in uplink slot n'.

[0293] In the embodiments of the present disclosure below, it is possible to apply individually by considering both interpretations of the ‘latest CSI-RS / CSI-IM / SSB occasion among the CSI-RS / CSI-IM / SSB occasions for CSI report #X transmitted in uplink slot n’. Additionally, when considering the two interpretations (interpretation 1-1, interpretation 1-2) described above for the CSI-RS occasion, CSI-IM occasion, and SSB occasion, in the embodiments of the present disclosure, the “latest CSI-RS / CSI-IM / SSB occasion among the CSI-RS / CSI-IM / SSB occasions for CSI report #X transmitted in uplink slot n’” can be applied individually by considering all four different interpretations (applying interpretation 1-1 and interpretation 2-1, applying interpretation 1-1 and interpretation 2-2, applying interpretation 1-2 and interpretation 2-1, applying interpretation 1-2 and interpretation 2-2).

[0294] The base station may instruct a CSI report by considering the amount of channel information that the terminal can simultaneously calculate for the CSI report, that is, the number of the terminal's channel information processing units (CSI processing units, CPUs). The number of channel information processing units that the terminal can simultaneously calculate If so, the terminal If you do not expect CSI report instructions from base stations that require more channel information calculations, or Updates to channel information that require more channel information calculations may not be considered. The terminal can report to the base station via upper layer signaling, or the base station can configure it via upper layer signaling.

[0295] The CSI report instructed by the base station to the terminal is the total number of channel information that the terminal can calculate simultaneously. It is assumed that some or all of the CPU is occupied for channel information calculation. For each CSI report, for example, CSI report The number of channel information calculation units required for If so, the number of channel information calculation units required for a total of N CSI reports is It can be said that the calculation unit of channel information required per reportQuantity set in the CSI report can be set as follows [Table 15].

[0296]

[0297] The number of channel information calculations required by the terminal for multiple CSI reports at a specific point in time is the number of channel information calculation units that the terminal can calculate simultaneously. In more cases, the terminal may not consider updating channel information for some CSI reports. Among multiple directed CSI reports, the CSI reports for which channel information updates are not considered are determined by taking into account at least the time the calculation of channel information required for the CSI report occupies the CPU and the priority of the reported channel information. For example, it may not consider updating channel information for a CSI report where the calculation of channel information required for the CSI report starts at the latest time, and it is possible to prioritize not considering channel information updates for CSI reports with lower channel information priority.

[0298] The priority of the above channel information can be determined by referring to [Table 16] below.

[0299]

[0300] The CSI priority for a CSI report is determined by the priority value Pri_iCSI(y,k,c,s) in [Table 16]. Referring to [Table 16], the CSI priority value is determined by the type of channel information included in the CSI report, the time-axis reporting characteristics of the CSI report (aperiodic, semi-persistent, periodic), the channel through which the CSI report is transmitted (PUSCH, PUCCH), the serving cell index, and the CSI report configuration index. The CSI priority for a CSI report is determined by comparing the priority value Pri_iCSI(y,k,c,s) and judging that the CSI report with the smaller priority value has a higher CSI priority.

[0301] If CPU occupation time is defined as the time the CPU is occupied by calculating channel information required for the CSI report instructed by the base station to the terminal, then CPU occupation time is determined by considering the type of channel information included in the CSI report (report quantity), the time-axis characteristics of the CSI report (aperiodic, semi-persistent, periodic), the slots or symbols occupied by the upper-layer signaling or DCI instructing the CSI report, and part or all of the slots or symbols occupied by the reference signal for channel state measurement.

[0302] [CSI Reporting Method via On-demand SSB Measurement]

[0303] According to one embodiment, for CSI reporting, the terminal may receive information or messages from a base station (e.g., M CSI resource settings set by the upper signal CSI-ResourceConfig, N CSI report settings set by the upper signal CSI-ReportConfig, one or two trigger state lists set by the upper signal CSI-AperiodicTriggerStateList and CSI-SemiPersistentOnPUSCH-TriggerStateList, etc.). Each trigger state included in CSI-AperiodicTriggerStateList may include a list of associated CSI-ReportConfigs indicating a resource set ID for channel measurement, and each trigger state included in CSI-SemiPersistentOnPUSCH-TriggerStateList may include one associated CSI-ReportConfig.

[0304] First, to measure the on-demand SSB for the S-cell, I will explain the method for setting the CSI resource settings for the on-demand SSB as the upper signal.

[0305] Each CSI resource setting in one or more CSI resource settings configured from the base station to the terminal by CSI-ResourceConfig information that can be transmitted as a higher signal may include a setting for a list of one or more CSI resource sets. The list of one or more CSI resource sets may include a set of information for one or more on-demand SSB transmissions or an index indicating each of the sets of information for on-demand SSB transmissions. The list may include a QCL reference to an NZP CSI-RS resource set or an SS / PBCH block set.

[0306] If a single CSI resource setting is configured by a higher-level signal, the resource setting configured by resourceForChannelMeasurement is for channel measurement by on-demand SSB and may be for L1-RSRP calculation.

[0307] Next, we will explain a method for reporting L1-RSRP by performing on-demand SSB measurements on S-cells.

[0308] Each CSI reporting setting configured by CSI-ReportConfig information that can be transmitted as an upper signal by a base station may be associated with a single downlink BWP indicated by a BWP-Id included in a CSI-Resource Config configured for channel measurement for an on-demand SSB, and the CSI reporting setting may include parameters for a single CSI reporting band (e.g., CSI-related quantities to be reported by the terminal, such as L1-RSRP, L1-SINR, SSBRI (SSB Resource Indicator), time domain procedures for CSI reporting and measurement, frequency granularity, measurement restriction settings, etc.). The time domain procedures for CSI reporting and measurement are indicated by reportConfigType as an upper signal and may be set to "aperiodic", "semiPersistentOnPUCCH", "semiPersistentOnPUSCH", or "periodic". Here, "aperiodic" may mean non-periodic CSI reporting, "periodic" may mean periodic CSI reporting, "semiPersistentOnPUCCH" may mean semi-persistent CSI reporting via PUCCH, and "semiPersistentOnPUSCH" may mean semi-persistent CSI reporting via PUSCH. For "periodic", "semiPersistentOnPUCCH", and "semiPersistentOnPUSCH" CSI reports, the reporting period and slot offset set in the parent signal may be determined by the numerology or SCS (subcarrier spacing) of the uplink BWP of the cell configured to transmit the CSI report.

[0309] If timeRestrictionForChannelMeasurements included in the CSI-ReportConfig information that can be transmitted as an upper signal by the base station is set to "notConfigured", the terminal can perform channel measurements to calculate the L1-RSRP reported in uplink slot n based on an on-demand SSB transmission that is not delayed compared to the CSI reference resource associated with the CSI resource setting.

[0310] If timeRestrictionForChannelMeasurements included in the CSI-ReportConfig information that can be transmitted as an upper signal by the base station is set to "Configured", the terminal can perform channel measurements for the calculation of L1-RSRP reported in uplink slot n based on the most recent on-demand SSB transmission occasion, without being delayed compared to the CSI reference resource associated with the CSI resource setting.

[0311] For example, if nrofReportedRS included in the CSI-ReportConfig information that can be transmitted to the upper signal is set to "1" or "one", the reported L1-RSRP can be defined by a 7-bit value in the range of [-140, -44]dBm with a step size of 1dB.

[0312] For example, if nrofReportedRS included in the CSI-ReportConfig information that can be transmitted to the upper signal is set to a value greater than "1" or "one", or if groupBasedBeamReporting is set to "enable" by the upper signal, differential L1-RSRP-based reporting may be used. For example, the largest L1-RSRP measurement may be quantized into a 7-bit value in the range of [-140, -44]dBm with a 1dB step size, and the differential L1-RSRP may be quantized into a 4-bit value with a 2dB step size.

[0313] [How to Trigger and End CSI Reports via On-Demand SSB Measurements]

[0314] We will explain how to trigger and terminate periodic CSI reporting via on-demand measurement for S-cells, semi-continuous CSI reporting via PUCCH, and semi-continuous CSI reporting via PUSCH, respectively.

[0315] First, we will explain how to trigger periodic CSI reporting through on-demand SSB measurements for S-cells. According to one embodiment, at least one of the methods described or illustrated may be used or a combination thereof.

[0316] - Triggering based on S-cell activation status: For example, in the case of a base station or terminal that does not support on-demand SSB for an S-cell, if the S-cell is not activated (i.e., the S-cell is in a deactivated state or the terminal has not received an activation instruction for the S-cell from the base station), the terminal may not report the CSI for the S-cell.

[0317] - Triggering based on on-demand SSB transmission settings and / or CSI-related setting information: For example, in the case of a base station or terminal that supports on-demand SSB for an S-cell, if there is no setting for on-demand SSB transmission, or if there is no setting for CSI resources or CSI reporting for the on-demand SSB for the S-cell, or if the S-cell is not activated, the terminal may not report CSI for the S-cell.

[0318] - Triggering based on a configuration signal and / or transmission instruction for on-demand SSB transmission: For example, in the case of a base station or terminal supporting on-demand SSB for an S-cell, when the S-cell is configured for the terminal and no activation instruction is received by the terminal, a higher signal for on-demand SSB transmission may be configured, and a higher signal for CSI resources or CSI reporting for the on-demand SSB may be configured. If the configuration of the higher signal for on-demand SSB transmission itself signifies an instruction for on-demand SSB transmission, or if the higher signal or another higher signal instructs transmission for a specific on-demand SSB, the terminal may trigger periodic CSI reporting for the S-cell. For example, the point in time when the terminal first transmits a periodic CSI report for an S-cell may be the terminal implementation, or the periodic CSI report may first be transmitted in slot n+k (if slot n+k is not an uplink slot, the first uplink slot appearing after slot n+k) based on slot n where the upper signals were received, slot n where a HARQ-ACK for a PDSCH containing the upper signals was transmitted, slot n where the upper signals indicated that an on-demand SSB would be transmitted, or slot n where the terminal received the on-demand SSB. Here, k may be a natural number such that k ≥ 1. Although the above description is based on slots, other time units, such as OFDM symbols or radio frames, may also be used.

[0319] Next, I will explain how to complete periodic CSI reporting through on-demand SSB measurements for S-cells.

[0320] - When a release signal for on-demand SSB transmission and / or a release signal for related CSI reporting is received explicitly or implicitly from a base station: For example, in the case of a base station or terminal supporting on-demand SSB for an S-cell, when the S-cell is configured for the terminal and the terminal has not received an activation instruction for said S-cell, the terminal may transmit periodic CSI reporting for on-demand SSB transmission from a P-cell or another activated S-cell according to the embodiment of the present invention. At this time, the release for on-demand SSB transmission may be configured by a higher signal, or the release for CSI resources or CSI reporting for the on-demand SSB may be configured through a higher signal. Alternatively, upon receiving a higher signal, one on-demand SSB transmission that was "enabled" to be transmitted among multiple on-demand SSB transmission configurations may be changed back to "disabled." Alternatively, the number of on-demand SSB transmissions configured by the higher signal may be completed, or the final moment of the transmission interval may arrive. At this time, the terminal may end periodic CSI reporting for the on-demand SSB for the S-cell. The point at which the terminal ends periodic CSI reporting for the S-cell may be the terminal implementation, or the periodic CSI reporting may be completed after a time defined in the specification or set by a higher signal based on the number of transmissions of the on-demand SSB or the transmission window of the on-demand SSB. Alternatively, the transmission of the periodic CSI report may be completed at slot n+m based on slot n where the said higher signals were received, or slot n where a HARQ-ACK for the PDSCH containing said higher signals was transmitted, or slot n where the said higher signal indicated that the transmission of the on-demand SSB had ended, or slot n where the terminal last received the on-demand SSB.Here, m can be a natural number such that m≥1. Although the above explanation was based on slots, other time units, such as OFDM symbols or radio frames, may also be used.

[0321] Next, we will describe a method for triggering semi-continuous CSI reporting via PUCCH and semi-continuous CSI reporting via PUSCH through on-demand SSB measurement for S-cells. According to one embodiment, at least one of the methods described or illustrated may be used or a combination thereof.

[0322] - Triggering based on S-cell activation status: For example, in the case of a base station or terminal that does not support on-demand SSB for an S-cell, if the S-cell is not activated (i.e., the S-cell is in a deactivated state or the terminal has not received an activation instruction for the S-cell from the base station), the terminal may not report the CSI for the S-cell.

[0323] - Triggering based on on-demand SSB transmission settings and / or CSI-related setting information: For example, in the case of a base station or terminal that supports on-demand SSB for an S-cell, if there is no setting for on-demand SSB transmission, or if there is no setting for CSI resources or CSI reporting for the on-demand SSB for the S-cell, or if the S-cell is not activated, the terminal may not report CSI for the S-cell.

[0324] - Triggering based on a configuration signal and / or a transmission instruction (transmission enable instruction) for on-demand SSB transmission: For example, in the case of a base station or terminal supporting on-demand SSB for an S-cell, when the S-cell is configured for the terminal and the terminal has not received an enable instruction, a higher signal for on-demand SSB transmission may be configured, and a higher signal for CSI resources or CSI reporting for the on-demand SSB may be configured. If the configuration of the higher signal for on-demand SSB transmission itself signifies an instruction for on-demand SSB transmission, or if the higher signal or another higher signal instructs the transmission of a specific on-demand SSB, a semi-persistent CSI reporting via PUCCH may be triggered through a MAC-CE signal to trigger semi-persistent CSI reporting in a P-cell, or a semi-persistent CSI reporting via PUSCH may be triggered through DCI in a P-cell or another activated S-cell.

[0325] - A method of triggering the transmission of a specific on-demand SSB through a method in which it is directed by a MAC-CE signal, or a method of triggering together through said MAC-CE signal: For example, in the case of a base station or terminal supporting an on-demand SSB for an S-cell, when the S-cell is configured for the terminal and no activation instruction is received by the terminal, a higher signal for on-demand SSB transmission may be configured, and a higher signal for CSI resources or CSI reporting for the on-demand SSB may be configured. At this time, the transmission of a specific on-demand SSB according to the transmission settings of said on-demand SSB may be directed by a MAC-CE signal in the P-cell, etc. In this case, a semi-persistent CSI reporting through PUCCH may be triggered together by said MAC-CE signal. Alternatively, a field for triggering a semi-persistent CSI reporting through PUCCH may be included in the MAC-CE signal for instructing the activation of the S-cell in the P-cell. In this case, a semi-persistent CSI reporting through PUCCH may be triggered together by said MAC-CE. Alternatively, the MAC-CE signal in the P-cell may be designed to include a specific on-demand SSB transmission instruction, an S-cell activation instruction, and a semi-persistent CSI reporting instruction in the PUCCH. In this case, the semi-persistent CSI reporting via the PUCCH may be triggered together by the MAC-CE signal. Alternatively, when the specific on-demand SSB indicated by the MAC-CE signal is received by the terminal, the semi-persistent CSI reporting via the PUCCH may be implicitly triggered.The point in time when the terminal first transmits a semi-persistent CSI report via PUCCH for an S-cell may be the terminal implementation, or the semi-persistent CSI report may first be transmitted via PUCCH in slot n+k1 (if slot n+k1 is not an uplink slot, the first uplink slot appearing after slot n+k1) based on slot n where the MAC-CE signals were received, slot n where a HARQ-ACK for a PDSCH containing the MAC-CE signal was transmitted, slot n where the MAC-CE signal indicated that an on-demand SSB would be transmitted, or slot n where the terminal received the on-demand SSB. Here, k1 may be a natural number such that k1 ≥ 1. Although the above description is based on slots, other time units, such as OFDM symbols or radio frames, may also be used.

[0326] Next, we will explain the method for completing semi-continuous CSI reporting via PUCCH through on-demand SSB measurement for S-cells and the semi-continuous CSI reporting via PUSCH. According to one embodiment, at least one of the methods described or illustrated may be used or a combination thereof.

[0327] - When information for ending the report (e.g., an indicator, etc.) is received via the MAC-CE signal of the base station (explicitly or implicitly transmitted to the terminal): For example, in the case of a base station or terminal that supports on-demand SSB for an S-cell, when the S-cell is configured for the terminal and the terminal has not received an activation instruction, the terminal may transmit a semi-persistent CSI report via PUCCH for on-demand SSB transmission and a semi-persistent CSI report via PUSCH to a P-cell or another activated S-cell according to the embodiment of the present invention. At this time, the semi-persistent CSI report via PUCCH may be ended via the MAC-CE signal in the P-cell, or the semi-persistent CSI report via PUSCH may be ended via the DCI in the P-cell or another activated S-cell.

[0328] - When the transmission of a specific on-demand SSB is completed (explicitly or implicitly delivered to the terminal): For example, in the case of a base station or terminal that supports an on-demand SSB for an S-cell, when the S-cell is configured for the terminal and the terminal has not received an activation instruction for said S-cell, the terminal may transmit a semi-persistent CSI report via PUCCH and a semi-persistent CSI report via PUSCH for the on-demand SSB transmission to a P-cell or another activated S-cell according to the embodiment of the present invention. At this time, the completion of the transmission of a specific on-demand SSB according to the transmission settings of said on-demand SSB may be indicated by a MAC-CE signal. In this case, the semi-persistent CSI report via PUCCH may end together by said MAC-CE signal. Alternatively, the number of transmissions of the on-demand SSB set by the upper signal may be completed or the last moment of the transmission interval may arrive. In this case, the semi-persistent CSI report via PUCCH may end. The point at which the terminal finishes the semi-persistent CSI report for the S-cell may be the terminal implementation, or it may be based on the number of transmissions of the on-demand SSB or the transmission window of the on-demand SSB. Alternatively, the transmission of the semi-persistent CSI report may be completed in slot n+m1 based on slot n where the MAC-CEs were received, slot n where the HARQ-ACK for the PDSCH containing the MAC-CEs was transmitted, slot n where the MAC-CE signal indicated that the transmission of the on-demand SSB had ended, or slot n where the terminal last received the on-demand SSB. Here, m1 may be a natural number such that m1 ≥ 1. Although the above description is based on slots, other time units, such as OFDM symbols or radio frames, may also be used.

[0329] [Method for Determining Priority for CSI Reporting through On-demand SSB Measurement]

[0330] If all CSI reports transmitted in a PUCCH are composed of a single part, the terminal may omit at least some of the CSI reports. The omission of CSIs is determined according to the priority order determined by the priority rule described below, and CSI reports with the lowest priority may be omitted until the code rate of the CSI report is equal to or less than the value set by maxCodeRate, which can be set as a higher signal. If two PUCCHs for CSI reports overlap in time resources, the PUCCH to be transmitted as the PUCCH containing the higher priority CSI may be determined according to the priority order determined by the priority rule described below.

[0331] According to one embodiment, the omission of a CSI report may be determined by the following priority rule, and Pri_ iCSI The lower the value of (y, k, c, s), the higher the priority can be assigned.

[0332]

[0333] Pri_ above iCSI The description of (y, k, c, s) may be based on the content described in Table 16 and the following. Here, y is determined by the time domain procedure for CSI reporting and measurement directed by reportConfigType as the upper signal, and y=0 for non-periodic CSI reports transmitted from PUSCH, y=1 for semi-periodic CSI reports transmitted from PUSCH, y=2 for semi-periodic CSI reports transmitted from PUCCH, and y=3 for periodic CSI reports transmitted from PUCCH.

[0334] Next, k is determined based on whether the CSI report contains L1-RSRP; k=0 may be assigned for CSI reports containing L1-RSRP, and k=1 for CSI reports not containing L1-RSRP. Next, c is the serving cell index, and is the value determined by the parent signal maxNrofServingCells. Next, s is the value determined by the parent signal reportConfigID, and is the value determined by the upper signal maxNrofCSI-ReportConfigurations.

[0335] According to the priority rules described above, if a CSI report for an on-demand SSB measurement is a periodic or semi-continuous CSI report, it may have a lower priority than a CSI report for a P-cell or another active S-cell, or it may be omitted. In this case, since the base station cannot receive a CSI report for the on-demand SSB from the terminal, a problem may arise where the base station must additionally consume energy by transmitting the on-demand SSB. Therefore, to resolve the above issue, a method is proposed to increase the priority of the CSI report for the on-demand SSB measurement compared to other CSI reports. An embodiment or method for increasing the priority may be applied separately, or one or more embodiments may be applied in combination.

[0336] According to one embodiment, for CSI reporting on on-demand SSB, Pri_ iCSISpecific parameter values ​​for (y, k, c, s) can be adjusted. In one embodiment, for CSI reporting to an on-demand SSB, y=0 can be applied regardless of whether it is periodic CSI reporting, non-periodic CSI reporting, semi-continuous CSI reporting transmitted from PUSCH, or semi-continuous CSI reporting transmitted from PUCCH. In another embodiment, c=0 can be applied to an S cell for CSI reporting to an on-demand SSB.

[0337] According to one embodiment, for CSI reporting on on-demand SSB, a new Pri_ iCSI (y, k, c, s) can be defined. As an example, in the case of a CSI report for an on-demand SSB, Pri_ iCSI (y, k, c, s)= * c + s can be applied. As another embodiment, for S-cells for CSI reporting on on-demand SSBs, the existing formula Pri_ iCSI (y, k, c, s) = 2 * * * y + * * k + Apply * c + s, and for the remaining cells—cells P, cells S where on-demand SSB is not supported or set, and cells S where on-demand SSB is set but is already active—use the existing formula Pri_ iCSI The priority can be lowered by adding an additional offset indexoffset_ODSSB to (y, k, c, s) (i.e., a lower priority value can be applied). Here, min{indexoffset_ODSSB} > max{Pri_ iCSI indexoffset_ODSSB can be applied to make it (y, k, c, s)}, and indexoffset_ODSSB can be defined in the specification or set by a higher signal.

[0338] According to one embodiment, for CSI reporting on an on-demand SSB of an S cell that is set by a higher signal but is not yet activated, the existing formula Pri_ iCSI (y, k, c, s) = 2 * * * y + * * k + Regardless of the value calculated by * c + s, the highest priority can always be assigned (i.e., a higher priority value can be applied). If there are multiple S cells that are set by the above upper signal but are not yet activated, and CSI reporting for on-demand SSB needs to be performed, the highest priority can be defined starting from the S cell with the lowest cell index.

[0339] [CPU Occupancy Method Related to CSI Reporting via On-demand SSB Measurement]

[0340] For a CSI report configured with a CSI-ReportConfig in which the upper signal CSI-ReportConfig, where the upper parameter reportQuantity related to CSI to be reported by the terminal is not set to 'none', the CPU (CSI Processing Unit) may be occupied for multiple OFDM symbols.

[0341] According to one embodiment, a terminal may determine that the CPU is occupied from the first symbol of the fastest measurement resource (CSI-RS / CSI-IM / SSB) for channel or interference measurement to the last symbol of the PUSCH / PUCCH containing the CSI report, for periodic CSI reports or semi-continuous CSI reports (provided, provided that the semi-continuous CSI report is an initial semi-continuous CSI report transmitted for the first time in PUSCH after a PDCCH trigger). In this case, the fastest measurement resource may mean the last measurement resource that does not exist later than the corresponding CSI reference resource.

[0342] According to one embodiment, in the case of an initial semi-persistent CSI report transmitted for the first time in PUSCH after a PDCCH trigger, the terminal may determine that the CPU is occupied from the first symbol after PDCCH to the last symbol of PUSCH containing the CSI report.

[0343] According to one embodiment, in the case of a non-periodic CSI report, the terminal may determine that the CPU is occupied from the first symbol after the PDCCH that triggers the CSI report to the last symbol of the PUSCH containing the CSI report.

[0344] Next, regarding the CSI report configured with the upper signal CSI-ReportConfig, where the CSI-related upper parameter reportQuantity, which must be reported by the terminal, is set to 'none' without trs-info for RX beam sweeping,

[0345] According to one embodiment, in the case of a semi-persistent CSI report, when calculating L1-RSRP, the terminal may determine that the CPU is occupied from the first symbol of the fastest of each transmission occupancy of the periodic / semi-persistent resource for channel measurement up to the Z_3' symbol after the last symbol of the last.

[0346] Next, a method for CPU occupancy for CSI reporting on the on-demand SSB will be described when the on-demand SSB is configured and transmitted as described in FIG. 16 or FIG. 17.

[0347] First, using FIGS. 18, 19, 20, and 21, a method for CPU occupancy for CSI reporting on an on-demand SSB is proposed depending on whether the MAC-CE instructing on-demand SSB transmission includes instructions for semi-persistent CSI reporting.

[0348] FIG. 18 is a diagram illustrating an example of a method for securing a CPU for channel reporting when on-demand SSB transmission is directed by a MAC-CE according to an embodiment of the present disclosure. In particular, when the MAC-CE directing on-demand SSB transmission includes a directive for semi-continuous CSI reporting, a method for securing a CPU for CSI reporting for on-demand SSB will be described.

[0349] As shown in the drawing, a PDSCH containing a MAC-CE that directs on-demand SSB transmission can be scheduled by a PDCCH (or DCI format). At this time, when a semi-persistent CSI report transmission for the on-demand SSB directed by the MAC-CE is set as a higher signal and transmitted to a PUCCH, the terminal needs to determine the CPU occupancy time for the on-demand SSB to perform the semi-persistent CSI report.

[0350] As a first embodiment, the terminal may determine that the CPU is occupied from the first symbol of the fastest measurement resource (on-demand SSB) for channel or interference measurement to the last symbol of the PUCCH containing the CSI report. In this case, the fastest measurement resource may refer to the last measurement resource that does not exist later than the corresponding CSI reference resource. According to one embodiment, the fastest measurement resource may be the first symbol of the on-demand SSB that is actually transmitted after receiving a MAC-CE instructing on-demand SSB transmission.

[0351] As a second embodiment, the terminal may determine that the CPU is occupied from the last symbol containing the PDSCH of the MAC-CE instructing on-demand SSB transmission to the last symbol of the PUCCH containing the CSI report.

[0352] In a third embodiment, the terminal may determine that the CPU is occupied from the last symbol containing a PDCCH that schedules a MAC-CE that directs an on-demand SSB transmission to the last symbol of a PUCCH that contains the CSI report.

[0353] Since the terminal can occupy the CPU for the on-demand SSB for a long time in the order of the third, second, and first embodiments to perform the above semi-continuous CSI reporting, there may be an advantage in that the CSI reporting for the on-demand SSB can be prioritized over other CSI reporting.

[0354] FIG. 19 is a diagram illustrating an example of a method for securing a CPU for channel reporting when on-demand SSB transmission is instructed by a MAC-CE according to an embodiment of the present disclosure. In particular, a method for securing a CPU for CSI reporting for on-demand SSB is described when there is a separate MAC-CE that instructs on-demand SSB transmission and a separate PDCCH that schedules the MAC-CE, and a separate PDCCH that includes an instruction (activation) for semi-persistent CSI reporting.

[0355] As shown in FIG. 19, a PDSCH containing a MAC-CE instructing on-demand SSB transmission can be scheduled by a PDCCH (or DCI format). Additionally, if a semi-persistent CSI report transmission is set as the upper signal and another PDCCH (or DCI format) different from the above PDCCH instructs (activates) the semi-persistent CSI report transmitted to PUSCH, the terminal needs to determine the CPU occupancy time for the on-demand SSB to perform the semi-persistent CSI report. FIG. 19 assumes that the MAC-CE instructing on-demand SSB transmission or the PDCCH scheduling the MAC-CE is transmitted and received by the terminal before the PDCCH instructing the semi-persistent CSI report transmitted to PUSCH; however, it is also possible for the PDCCH instructing the semi-persistent CSI report to be transmitted first.

[0356] As a first embodiment, the terminal may determine that the CPU is occupied from the first symbol of the fastest measurement resource (on-demand SSB) for channel or interference measurement to the last symbol of the PUSCH containing the CSI report. In this case, the fastest measurement resource may refer to the last measurement resource that does not exist later than the corresponding CSI reference resource. According to one embodiment, the fastest measurement resource may be the first symbol of the on-demand SSB that is actually transmitted after receiving a MAC-CE instructing on-demand SSB transmission.

[0357] As a second embodiment, the terminal may determine that the CPU is occupied from the last symbol containing a PDCCH that directs (activates) a semi-persistent CSI report to the last symbol of a PUSCH that contains the CSI report.

[0358] As a third embodiment, the terminal may determine that the CPU is occupied from the last symbol containing the PDSCH of the MAC-CE instructing on-demand SSB transmission to the last symbol of the PUCCH containing the CSI report.

[0359] As a fourth embodiment, the terminal may determine that the CPU is occupied from the last symbol containing a PDCCH that schedules a MAC-CE instructing an on-demand SSB transmission to the last symbol of a PUSCH that contains the CSI report.

[0360] Since the terminal can occupy the CPU for the on-demand SSB for a long time in the order of the fourth, third, second, and first embodiments to perform the above semi-continuous CSI reporting, there may be an advantage in that the CSI reporting for the on-demand SSB can be prioritized over other CSI reporting.

[0361] FIG. 20 is a diagram illustrating an example of a method for securing a CPU for channel reporting when on-demand SSB transmission is instructed by a MAC-CE according to an embodiment of the present disclosure. In particular, a method for securing a CPU for CSI reporting for on-demand SSB is described when there is a separate MAC-CE instructing on-demand SSB transmission and a PDCCH scheduling said MAC-CE, and a separate MAC-CE instructing semi-persistent CSI reporting and a PDCCH scheduling said MAC-CE.

[0362] As shown in FIG. 20, a PDSCH containing a MAC-CE that directs on-demand SSB transmission can be scheduled by a PDCCH (or DCI format). Additionally, if a semi-persistent CSI report transmission is set as a higher signal, and a PDCCH (or DCI format) and MAC-CE different from the PDCCH or MAC-CE are transmitted to a terminal, and the MAC-CE directs a semi-persistent CSI report to be transmitted to a PUCCH, the terminal needs to determine the CPU occupancy time for the on-demand SSB to perform the semi-persistent CSI report.

[0363] In FIG. 20, it is assumed that a MAC-CE instructing on-demand SSB transmission or a PDCCH scheduling said MAC-CE is transmitted and received by a terminal before a MAC-CE instructing a semi-continuous CSI report transmitted to a PUCCH or a PDCCH scheduling said MAC-CE, but it is also possible for the MAC-CE instructing the semi-continuous CSI report or the PDCCH scheduling said MAC-CE to be transmitted first.

[0364] As a first embodiment, the terminal may determine that the CPU is occupied from the first symbol of the fastest measurement resource (on-demand SSB) for channel or interference measurement to the last symbol of the PUCCH containing the CSI report. In this case, the fastest measurement resource may refer to the last measurement resource that does not exist later than the corresponding CSI reference resource. According to one embodiment, the fastest measurement resource may be the first symbol of the on-demand SSB that is actually transmitted after receiving a MAC-CE instructing on-demand SSB transmission.

[0365] As a second embodiment, the terminal may determine that the CPU is occupied from the last symbol containing the PDSCH of the MAC-CE that directs a semi-persistent CSI report to the last symbol of the PUCCH that contains the CSI report.

[0366] As a third embodiment, the terminal may determine that the CPU is occupied from the last symbol containing a PDCCH that schedules a MAC-CE that directs a semi-persistent CSI report to the last symbol of a PUCCH that contains the CSI report.

[0367] As a fourth embodiment, the terminal may determine that the CPU is occupied from the last symbol containing the PDSCH of the MAC-CE instructing on-demand SSB transmission to the last symbol of the PUCCH containing the CSI report.

[0368] As a fifth embodiment, the terminal may determine that the CPU is occupied from the last symbol containing a PDCCH that schedules a MAC-CE that directs an on-demand SSB transmission to the last symbol of a PUCCH that contains the CSI report.

[0369] Since the terminal can occupy the CPU for the on-demand SSB for a long time in the order of the fifth, fourth, third, second, and first embodiments to perform the above semi-continuous CSI reporting, there may be an advantage in that the CSI reporting for the on-demand SSB can be prioritized over other CSI reporting.

[0370] Next, we will explain the method for securing CPUs for channel reporting when on-demand SSB transmission is instructed by the RRC. Periodic or semi-continuous CSI report transmission may be configured together with the higher-level signal instructing the aforementioned on-demand SSB transmission, or they may be configured separately by a distinct RRC.

[0371] As a first embodiment, a method for CPU occupancy for CSI reporting on an on-demand SSB is described where there is a MAC-CE instructing for semi-persistent CSI reporting or a PDCCH scheduling said MAC-CE. The terminal may determine that the CPU is occupied from the first symbol of the fastest measurement resource (on-demand SSB) for channel or interference measurement to the last symbol of the PUCCH containing said CSI reporting. In this case, said fastest measurement resource may mean the last measurement resource that does not exist later than the corresponding CSI reference resource. According to one embodiment, said fastest measurement resource may be the first symbol of the on-demand SSB actually transmitted after receiving the MAC-CE instructing on-demand SSB transmission.

[0372] As a second embodiment, a method for CPU occupancy for CSI reporting on an on-demand SSB is described when a setting or instruction for periodic CSI reporting exists in the upper signal. The terminal may determine that the CPU is occupied from the first symbol of the fastest measurement resource (on-demand SSB) for channel or interference measurement to the last symbol of the PUCCH containing the CSI report. In this case, the fastest measurement resource may refer to the last measurement resource that does not exist later than the corresponding CSI reference resource. According to one embodiment, the fastest measurement resource may be the first symbol of the on-demand SSB actually transmitted after receiving a MAC-CE instructing on-demand SSB transmission.

[0373] As a third embodiment, a method for CPU occupancy for CSI reporting on an on-demand SSB is described when a setting or instruction for periodic CSI reporting exists in a higher-level signal. The terminal may determine that the CPU is occupied from the last symbol containing a PDCCH that schedules an RRC setting or instruction for periodic CSI reporting to the last symbol of a PUCCH containing said CSI reporting. According to one embodiment, the terminal may determine that the CPU is occupied from the last symbol containing a PDSCH containing said RRC to the last symbol of a PUCCH containing said CSI reporting.

[0374] FIG. 21 is a flowchart of the operation of a terminal applying an energy saving method of a wireless communication system according to one embodiment of the present disclosure.

[0375] Various modifications may be made to the method illustrated in the flowchart of FIG. 21. For example, although illustrated as a series of steps, the various steps in each figure may overlap, occur in parallel, occur in a different order, or occur multiple times. In other examples, steps may be omitted or replaced with other steps.

[0376] Based on Fig. 21, the operation of the terminal during the on-demand SSB operation for the S-cell for energy saving by the base station is described.

[0377] Referring to FIG. 21, in step 2101, the terminal can receive a setting for an S cell for CA (carrier aggregation) from the base station.

[0378] In step 2102, the terminal may receive from the base station on-demand SSB transmission settings for the S cell and settings related to CSI measurement / reporting. Additionally, the terminal may receive an activation instruction for on-demand SSB transmission for the S cell. It may also receive an activation instruction for the S cell. It may also receive an activation instruction for CSI measurement or reporting of the on-demand SSB.

[0379] In step 2103, the terminal determines the CPU for on-demand SSB reporting for the S cell from the base station, receives the on-demand SSB, and can perform measurements for CSI reporting of the on-demand SSB.

[0380] In step 2104, the terminal may transmit a CSI report of an on-demand SSB for the S cell to the base station. In one embodiment, the terminal may receive an activation instruction for the S cell from the base station after the CSI report. In another embodiment, the terminal may receive a reference signal (e.g., CSI-RS) for QCLed channel measurement based on the received on-demand SSB and report a CQI to the base station after the channel measurement.

[0381] Specific details of the terminal operation according to one embodiment of the present disclosure described above may be referenced to the description of one embodiment of the present disclosure described above.

[0382] FIG. 22 is a flowchart of the operation of a base station applying an energy saving method of a wireless communication system according to one embodiment of the present disclosure.

[0383] Various modifications may be made to the method illustrated in the flowchart of FIG. 22. For example, although it is illustrated as a series of steps, the various steps in each figure may overlap, occur in parallel, occur in a different order, or occur multiple times. In other examples, steps may be omitted or replaced with other steps.

[0384] Referring to FIG. 22, in step 2201, the base station can transmit settings for an S cell for CA to the terminal.

[0385] In step 2202, the base station may transmit to the terminal on-demand SSB transmission settings for the S cell and settings related to CSI measurement / reporting. Additionally, the base station may transmit to the terminal an activation instruction for on-demand SSB transmission for the S cell. It may also transmit an activation instruction for the S cell. It may also transmit an activation instruction for CSI measurement or reporting of the on-demand SSB.

[0386] In step 2203, the base station can transmit an on-demand SSB for the S cell to the terminal.

[0387] In step 2204, the base station may receive a CSI report of an on-demand SSB for an S cell from the terminal. In one embodiment, the base station may transmit an activation instruction for the S cell to the terminal after receiving the CSI report. In another embodiment, the base station may transmit a reference signal (e.g., CSI-RS) for QCLed channel measurement based on the on-demand SSB to the terminal and receive a CQI from the terminal.

[0388] Specific details of the base station operation according to one embodiment of the present disclosure described above may be referenced to the description of one embodiment of the present disclosure described above.

[0389] The above-described flowchart illustrates an exemplary method that may be implemented in accordance with the principles of the present disclosure, and various modifications may be made to the method illustrated in the flowchart in this specification. For example, although illustrated as a series of steps, the various steps in each figure may overlap, occur in parallel, occur in a different order, or occur multiple times. In other examples, steps may be omitted or replaced with other steps.

[0390] FIG. 23 is a block diagram of a terminal according to one embodiment of the present disclosure.

[0391] Referring to FIG. 23, the terminal (2300) may include a transceiver (2301), a controller (e.g., a processor) (2302), and a storage unit (e.g., a memory) (2303). The transceiver (2301), the controller (2302), and the storage unit (2303) of the terminal (2300) may operate according to at least one or a combination thereof of the methods corresponding to the above-described embodiments. However, the components of the terminal (2300) are not limited to the illustrated examples. According to other embodiments, the terminal (2300) may include more components or fewer components than the above-described components. Furthermore, in certain cases, the transceiver (2301), the controller (2302), and the storage unit (2303) may be implemented in the form of a single chip.

[0392] According to one embodiment, the transceiver (2301) may be composed of a transmitter and a receiver. The transceiver (2301) may transmit and receive signals with a base station. The signals may include control information and data. The transceiver (2301) may be configured to include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies a received signal and down-converts the frequency. The transceiver (2301) may receive a signal through a wireless channel and output it to a control unit (2302), and transmit the signal output from the control unit (2302) through a wireless channel.

[0393] The control unit (2302) can control a series of procedures that allow the terminal (2300) to operate according to the embodiments of the present disclosure described above. For example, the control unit (2302) can perform or control the operation of the terminal to perform at least one of the methods according to the embodiments of the present disclosure or a combination thereof. The control unit (2302) may include at least one processor. For example, the control unit (2302) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls an upper layer (e.g., an application).

[0394] The storage unit (2303) can store control information (e.g., information related to channel estimation using DMRSs transmitted from a PUSCH included in a signal obtained from a terminal (2300)) or data, and may have an area for storing data required for control of the control unit (2302) and data generated during control by the control unit (2302).

[0395] FIG. 24 is a block diagram of a base station according to one embodiment of the present disclosure.

[0396] Referring to FIG. 24, the base station (2400) may include a transceiver (2401), a control unit (e.g., a processor) (2402), and a storage unit (e.g., a memory) (2403). The transceiver (2401), control unit (2402), and storage unit (2403) of the base station (2400) may operate according to at least one or a combination thereof of the methods corresponding to the above-described embodiments. However, the components of the base station (2400) are not limited to the illustrated examples. According to other embodiments, the base station (2400) may include more components or fewer components than the above-described components. Furthermore, in certain cases, the transceiver (2401), control unit (2402), and storage unit (2403) may be implemented in the form of a single chip.

[0397] According to one embodiment, the transceiver (2401) may be composed of a transmitter and a receiver. The transceiver (2401) may transmit and receive signals with a terminal. The signals may include control information and data. The transceiver (2401) may be configured to include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies a received signal and down-converts the frequency. The transceiver (2401) may receive a signal through a wireless channel and output it to a control unit (2402), and transmit the signal output from the control unit (2402) through a wireless channel.

[0398] The control unit (2402) can control a series of procedures to enable the base station (2400) to operate according to the embodiments of the present disclosure described above. For example, the control unit (2402) can perform or control the operation of the base station to perform at least one of the methods according to the embodiments of the present disclosure or a combination thereof. The control unit (2402) may include at least one processor. For example, the control unit (2402) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls an upper layer (e.g., an application).

[0399] The storage unit (2403) can store control information (e.g., information related to channel estimation generated using DMRSs transmitted in a PUSCH determined by the base station (2400)), data, control information received from a terminal, or data, and may have an area for storing data required for control of the control unit (2402) and data generated during control by the control unit (2402).

[0400] The drawings illustrate different examples of user devices / base stations, but various modifications to the drawings may be made. For example, a user device / base station may include any number of individual components in any suitable arrangement. In general, the drawings do not limit the scope of the disclosure to any specific configuration. Furthermore, while the drawings illustrate operating environments in which various user device / base station features disclosed in this patent document may be used, these features may be used in any other suitable system.

[0401] Methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0402] When implemented in software, a computer-readable storage medium may be provided for storing one or more programs (software modules). One or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. One or more programs include instructions that cause the electronic device to execute methods according to the embodiments described in the claims or specification of this disclosure.

[0403] Such programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, ROM (Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), magnetic disc storage devices, CD-ROM (Compact Disc-ROM), Digital Versatile Discs (DVDs), or other forms of optical storage devices, magnetic cassettes. Alternatively, they may be stored in memory composed of some or all of these. Additionally, each constituent memory may include multiple units.

[0404] Additionally, the above program may be stored on an attachable storage device that can be accessed via a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination thereof. Such a storage device may be connected to a device performing an embodiment of the present disclosure through an external port. Additionally, a separate storage device on a communication network may be connected to a device performing an embodiment of the present disclosure.

[0405] In the present disclosure, the terms “computer program product” or “computer readable medium” are used to collectively refer to media such as memory, a hard disk installed in a hard disk drive, and signals. These “computer program product” or “computer readable medium” are configurations provided in a method for reporting terminal capability in a wireless communication system according to the present disclosure.

[0406] A device-readable storage medium may be provided in the form of a non-transitory storage medium. Here, 'non-transitory storage medium' simply means that it is a tangible device and does not contain a signal (e.g., electromagnetic waves), and the term does not distinguish between cases where data is stored semi-permanently and cases where it is stored temporarily. For example, a 'non-transitory storage medium' may include a buffer in which data is stored temporarily.

[0407] According to one embodiment, the method according to the various embodiments disclosed herein may be provided by being included in a computer program product. The computer program product may be traded between a seller and a buyer as a product. The computer program product may be distributed in the form of a device-readable storage medium (e.g., compact disc read-only memory (CD-ROM)), or distributed online (e.g., download or upload) through an application store (e.g., Play Store™) or directly between two user devices (e.g., smartphones). In the case of online distribution, at least a portion of the computer program product (e.g., downloadable app) may be temporarily stored or temporarily created on a device-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

[0408] In the specific embodiments of the present disclosure described above, the components included in the invention are expressed in a singular or plural form according to the specific embodiments presented. However, the singular or plural expression is selected to suit the situation presented for convenience of explanation, and the present disclosure is not limited to singular or plural components; even if a component is expressed in the plural form, it may be composed of a singular form, or even if a component is expressed in the singular form, it may be composed of a plural form.

[0409] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are merely specific examples provided to facilitate the explanation of the technical content of the present disclosure and to aid in understanding the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is obvious to those skilled in the art that other variations based on the technical concept of the present disclosure are possible.

[0410] In addition, each of the above embodiments may be combined and operated as needed. For example, parts of one embodiment of the present disclosure and another embodiment may be combined to operate a base station and a terminal. Furthermore, the embodiments of the present disclosure are applicable to other communication systems, and other variations based on the technical concept of the embodiments may also be implemented. For example, the embodiments may be applied to LTE systems, 5G, NR systems, or 6G systems. Therefore, the scope of the present disclosure should not be limited to the described embodiments but should be defined by the claims set forth below as well as equivalents thereof.

[0411] Although the present disclosure has been described by exemplary embodiments, various changes and modifications may be presented to those skilled in the art. The present disclosure is intended to include such changes and modifications that fall within the scope of the appended claims. The description in this application should not be interpreted as implying that any specific element, step, or function is an essential element to be included in the claims. The scope of the patented subject matter is defined by the claims.

Claims

1. A method performed by UE (user equipment) in a wireless communication system, A step of receiving configuration information for the OD-SSB (on-demand synchronization signal and physical broadcast channel block) from a base station; A step of receiving DCI (downlink control information) for triggering SP-CSI (semi-persistent channel state information) from the base station; A step of receiving a MAC (medium access control) CE (control element) for triggering the OD-SSB on a PDSCH (physical downlink shared channel) scheduled by the DCI from the base station; A step of receiving one or more OD-SSBs from the base station based on the MAC CE; and The method includes the step of transmitting a CSI (channel state information) report for one or more OD-SSBs to the base station. A method in which the CPU (CSI processing unit) occupation time for one or more of the above OD-SSBs is determined from a first time point related to the MAC CE to a second time point in which the CSI report is transmitted.

2. In Paragraph 1, A method in which the first time point includes the last symbol at which the MAC CE is received, and the second time point includes the last symbol at which the CSI report is transmitted.

3. In Paragraph 1, A method in which the first time point includes the last symbol of the DCI scheduling the PDSCH at which the MAC CE is received, and the second time point includes the last symbol at which the CSI report is transmitted.

4. In Paragraph 1, A method in which the first time point includes the first symbol of the at least one OD-SSB received based on the MAC CE, and the second time point includes the last symbol to which the CSI report is transmitted.

5. In a method performed by a base station in a wireless communication system, A step of transmitting configuration information for the OD-SSB (on-demand synchronization signal and physical broadcast channel block) to the UE (user equipment); A step of transmitting DCI (downlink control information) to the above UE to trigger SP-CSI (semi-persistent channel state information); A step of transmitting a MAC (medium access control) CE (control element) for triggering the OD-SSB on a PDSCH (physical downlink shared channel) scheduled by the DCI to the above UE; A step of transmitting one or more OD-SSBs to the UE based on the MAC CE; and The method includes the step of receiving a CSI (channel state information) report for one or more OD-SSBs from the UE, A method in which the CPU (CSI processing unit) occupation time for one or more of the above OD-SSBs is determined from a first time point related to the MAC CE to a second time point in which the CSI report is transmitted.

6. In Paragraph 5, A method in which the first time point includes the last symbol at which the MAC CE is transmitted, and the second time point includes the last symbol at which the CSI report is received.

7. In Paragraph 5, A method in which the first time point includes the last symbol of the DCI that schedules the PDSCH in which the MAC CE is transmitted, and the second time point includes the last symbol in which the CSI report is received.

8. Regarding UE (user equipment): At least one transceiver; At least one processor communicatively coupled to the above at least one transceiver; and It includes at least one memory that is communicationally coupled to the above at least one processor and stores instructions, and The above instructions are executed individually or in any combination by the above at least one processor, so that the UE: Receive configuration information for the OD-SSB (on-demand synchronization signal and physical broadcast channel block) from the base station, and Receive DCI (downlink control information) from the base station to trigger SP-CSI (semi-persistent channel state information), and Receiving a MAC (medium access control) CE (control element) for triggering the OD-SSB on a PDSCH (physical downlink shared channel) scheduled by the DCI from the base station, and Based on the above MAC CE, one or more OD-SSBs are received from the base station, and To transmit a CSI (channel state information) report for one or more of the above OD-SSBs to the base station, and A UE, wherein the CPU (CSI processing unit) occupation time for one or more of the above OD-SSBs is determined from a first time point related to the MAC CE to a second time point in which the CSI report is transmitted.

9. In Paragraph 8, A UE, wherein the first time point includes the last symbol at which the MAC CE is received, and the second time point includes the last symbol at which the CSI report is transmitted.

10. In Paragraph 8, A UE, wherein the first time point includes the last symbol of the DCI scheduling the PDSCH in which the MAC CE is received, and the second time point includes the last symbol in which the CSI report is transmitted.

11. In Paragraph 8, A UE, wherein the first time point includes the first symbol of the at least one OD-SSB received based on the MAC CE, and the second time point includes the last symbol to which the CSI report is transmitted.

12. Regarding base stations: At least one transceiver; At least one processor communicatively coupled to the above at least one transceiver; and It includes at least one memory that is communicationally coupled to the above at least one processor and stores instructions, and The above instructions are executed individually or in any combination by the above at least one processor, so that the base station: Transmits configuration information for the OD-SSB (on-demand synchronization signal and physical broadcast channel block) to the UE (user equipment), and Transmitting DCI (downlink control information) to the UE to trigger SP-CSI (semi-persistent channel state information), and Transmits a MAC (medium access control) CE (control element) for triggering the OD-SSB on the PDSCH (physical downlink shared channel) scheduled by the DCI to the UE, and Based on the above MAC CE, one or more OD-SSBs are transmitted to the UE, and To receive a CSI (channel state information) report for one or more of the above OD-SSBs from the UE, and A base station, wherein the CPU (CSI processing unit) occupation time for one or more of the above OD-SSBs is determined from a first time point related to the MAC CE to a second time point when the CSI report is transmitted.

13. In Paragraph 12, A base station, wherein the first time point includes the last symbol at which the MAC CE is transmitted, and the second time point includes the last symbol at which the CSI report is received.

14. In Paragraph 12, A base station, wherein the first time point includes the last symbol of the DCI that schedules the PDSCH in which the MAC CE is transmitted, and the second time point includes the last symbol in which the CSI report is received.

15. In Paragraph 12, A base station, wherein the first time point includes the first symbol of the at least one OD-SSB transmitted based on the MAC CE, and the second time point includes the last symbol in which the CSI report is received.

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